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Workshop Grinding

06 Nov Types of Welds

Fillet Welds – A fillet weld joins two surfaces at an approximate right angle to each other. There are several types of fillet weld; a Full fillet weld where the size of the weld is the same thickness of the thinner object joining, a Staggered intermittent fillet weld refers to two lines of intermittent welding on a joint, and a Chain Intermittent fillet weld which refers to two lines on intermittent fillet welds in a lap joint or T where the welds are in one line.IMG_1582

Groove Welds – The second most popular type of weld, there are seven basic types of groove welds. The groove weld refers to beads that are deposited in a groove between two members to be joined. The type of weld used will determine the manner in which the seam, joint, or surface is prepared.

Seam Weld – A weld made by arc seam or resistance seam welding where the welding process is not specified. This term infers a resistance spot weld.

Surfacing Weld – These are welds composed of one or more strings or weave beads deposited on an unbroken surface to obtain desired properties or dimensions. This type of weld is used to build up surfaces or replace metal on worn surfaces. It is also used with square butt joints.

Plug Weld – Plug welds are circular welds made through one member of a lap or tee joint joining that member to the other. The weld may or may not be made through a hole in the first member; if a hole is used, the walls may or may not be parallel and the hole may be partially or completely filled with weld metal. Such welds are often used in place of rivets.

Slot Weld – This is a weld made in an elongated hole in one member of a lap or tee joint joining that member to the surface of the other member that is exposed through the hole. This hole may be open at one end or partially or completely filled with weld metal.

Flash Weld – A weld made by flash welding. Flash welding is referred to as a resistance welding process where fusion is produced over the entire abutting surface. Heat is created by the resistance to the current flow between two surfaces and by the application of pressure after heating is mostly complete. Flashing is accompanied by the expulsion of metal from the joint.

Spot Weld – A spot weld is a weld made by arc spot or resistance spot welding where the welding process is not specified. This term infers a resistance spot weld.

Upset Weld – An upset weld is a resistance welding process where fusion occurs progressively along a joint of over the entire abutting surface. The application of pressure before heating is required and occurs during the heating period. Heat comes from the resistance to the flow of electric current in the area of contact between the surfaces.

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gates

30 Sep 5 Most Common Metals Used to Fabricate Railings & Handrails

From building and reinforcing, to internal, decorative safety features: metal, in one form or another, plays an important part in the construction and fitting out of commercial properties. Handrails and railings are a case in point. Where some years ago, spindles and banisters would have been manufactured almost exclusively from timber, today they are more likely to be fabricated from stainless steel, mild steel, galvanised steel, aluminium or brass. They can also be designed to include a mixture of these materials. So, what are the pros and gatescons of these five different metals?

  1. Stainless Steel

If you’re looking for strength with a modern, stylish finish, either internally or externally, stainless steel tube ticks all the boxes. Although more expensive than mild steel, long term maintenance costs are reduced due to its high corrosion resistance. Stainless steel can be manufactured into a wide range of designs and styles, and fitted to brickwork, blockwork, concrete, timber and other metals to produce the contemporary, modern style required.

  1. Mild Steel

Mild steel is the cheapest option when it comes to guard rails and hand rails. Material costs are low, and the ease with which it can be worked make the construction element very cost-effective, depending of course, on the complexity of the required design. Under heavy-use circumstances, many architects choose to stipulate carbon steel for its added strength and durability. Although mild steel rails, hand rails and guards are usually powder coated or spray painted prior to installation, they are prone to corrosion and need regular inspection and maintenance to keep them at their best, especially if it is exposed outdoors.

  1. Galvanised Steel

Inside or out, unprotected steels are at the mercy of moisture either internally from moisture laden air, or externally from the weather. While painting will help keep much of this moisture away, galvanising all interior and exterior steelwork, whether walkways, stairs or hand rails, will provide years of protection. Standard galvanised steel can be a silver colour through to grey. Although galvanised steel can be painted, it requires the use of etch primers prior to painting, pushing up the manufacturing cost of the finished product.

  1. Aluminium

The biggest pro of aluminium is its weight, or lack of. While this lack of weight makes aluminium easy to handle and use, it is also a much softer metal compared to others, and prone to dents and scratches. When being used for handrails and safety railings, greater bare

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Welding in hollow section

05 Jul 20 Facts About Steel You Probably Didn’t Know

Workshop WeldingRecyclability & Renewable Energy

  1. Almost 69 percent of steel is recycled in North America each year, which is more than paper, aluminium, plastic, and glass combined.
  2. More than 80 million tons of steel are recycled in North America every year.
  3. Steel is roughly 1,000 times stronger than iron in its purest form, and it can be recycled without loss of strength.
  4. Steel is the main material used in delivering renewable energy like solar, hydro, and wind power.
  5. Since world war II, the north American steel industry has reduced its energy use by 60 percent, which has contributed to a significant reduction in carbon dioxide generation.

Global Involvement

  1. In developing countries, steel companies are the most involved trade with the provision of healthcare services and community-wide education.
  2. The steel industry has an estimated £900 billion turnover, making it the second largest industry in the world after oil and gas.
  3. Steel is used in almost every industry, including energy, construction and housing (the largest consumer of steel), automotive and transportation, infrastructure, packing, and machinery.
  4. The top 10 leading producers of steel to date are as follows, China, Japan, India, USA, Russia, South Korea, Germany, Turkey, Brazil and Ukraine.
  5. The steel industry directly employs more than 2 million people worldwide and continues to grow each year.

Steel Projects

  1. Steel roofs last more than 50 years while traditional roofs last about 17 years.
  2. 75% of all major appliances are comprised of steel.
  3. The average computer is about 25% steel.
  4. Steel was first used for skyscrapers in 1884 with the Home Insurance Building in Chicago. Modern steel buildings, like The Empire State Building (1930) in New York and the U.S. Steel Tower (1971) in Pittsburgh, are designed to easily assemble and disassemble.
  5. Because steel and iron expand when heated, the Eiffel Tower (1887), is about 6 inches taller in the summer than the winter.
  6. The first steel-made automobile was produced in 1918. Since then, steel seatbelts are required due to their consistent ability to withstand high-impact crashes.
  7. Steel bridges are 4-8 times lighter than those built from concrete. The Golden Gate Bridge (1937) required 83,000 tons of steel whereas half of that amount would be required today.
  8. Two-thirds of all canned goods packaging are made out of steel.
  9. More than 600 steel cans are recycled every second in the United States.
  10. Recycling a single steel can saves enough energy to power a 60-watt light bulb for almost 4 years.

There are many more facts that can be said about steel, I find that when working in the fabrication industry, no matter how much experienc you have you still learn new things everyday!

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07 Jun The Hazards in Metal Fabrication

Welding and cutting operations present a variety of hazards, not only to those carrying out the operation but in many instances to others in the vicinity.

In the workshop there are a number of hazards specific to welding or cutting. In addition, there may be other hazards of a more general nature present in the fabrication environment. All potential hazards need to be identified, measured and assessed. Remedial measures must be put in place wherever necessary.

Although Personal Protective Equipment (PPE) should not be issued as the primary method of reducing a hazard, it should be issued to all personnel if beneficial. Employers and employees should be made fully aware of the dangers that can arise and take all reasonable care to ensure the health and safety of all. Here are some hazards that you may encounter when working in the metal fabrication industry:

Chromium in Fume

Chromium is an element present in the consumables and parent material of stainless steel, heat-resisting steels, some creep-resisting steels, some high nickel alloys and armour plate. It may also be present in some consumables used for hard-facing.

Chromium is also used as a coating for other materials (such as chrome plating) to give corrosion protection to steel or to give a pleasing aesthetic appearance. Welding or cutting materials containing chromium are likely to give chromium compounds in any particulate fume generated by the process. Whether it presents a significant hazard to health depends on the concentration and the duration of exposure.

Heat Stressmaxresdefault

Working in an excessively hot environment can cause the body to overheat; this is called ‘heat stress’.

If fluids are not taken to replace those lost by sweating, heat exhaustion can occur. Extreme cases of this condition can be fatal. Precautions should be taken, and work regimes adjusted to ensure that every workers core body temperature is maintained within its required operating range.

Metal Fume Fever

Welding certain materials can give rise to fume containing freshly-formed metal oxide fume. If inhaled in sufficient concentration it can produce a reaction similar to a bout of flu. This is why it is most commonly known as ‘Metal Fume Fever’.

Although it normally lasts no more than a day, it is possible to get an attack of fume fever more than once. There is no evidence to suggest that repeated bouts cause cumulative damage. The metal oxides usually associated with metal fume fever are those of zinc and copper, although others can have the same effects. In welding and cutting, copper alloys, galvanised and some painted components are most likely to cause this problem.

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Tarrant Gunville 2

26 Apr How Stainless Steel Can Help Withstand Natural Disasters

In recent years the state weather bureau, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) has confirmed an increase in the number of destructive tropical cyclones. There was a total of 14 destructive tropical cyclones in the Philippines in 2013 including super Typhoon Haiyan, considered to be the strongest and most destructive Steel Frametyphoon to make landfall in the world in recent history.

Another destructive force of nature is the violent tremors of earthquakes. The fear these provoke is often heightened by the unexpected occurrence coupled with intensity and duration. Such was the case in 2013 when a quake measuring 7.3 on the Richter Scale was recorded in Bohol and Cebu.

The Philippines is located in the Pacific Ring of Fire, and a resurgence for reminders about the forthcoming ‘Big One’ predicted to come from the West Valley Fault reverberated in mass media.

These alarming Occurrences have given rise to Project Noah and the 2004 Metro Manila Earthquake impact reduction study (MMEIRS). The Philippine Institute of Volcanology and Seismology (PHILVOCS) provides that latest bulletins and advisories on the earthquakes and their recorded intensities locally and around the globe. It also gives updates on the status of the active volcanoes that it constantly monitors.

Prevention is better than cure. 

Material selection is a decisive factor for the durability of infrastructural buildings and installations, particularly for those underground. These may pass under water or through mountains where they are rarely seen or monitored once installed. Which is why Stell is the most common option, galvanised steel is practically indistrucable! It wont rust, morph or collapsed during such natural disasters as earthquakes, tsunami’s or hurricanes.

The steel must be able to meet the criteria in an environment that has aggressive atmospheric conditions and is subject to strong vibrations. In Tokyo, for instance, they have managed to survive strong earthquakes for the past three decades. The elasticity and ductility of the steel absorbs shocks without breaking or cracking. Due to this foresight, even in catastrophic situations, drinking water continues to be available.

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3D Printing

05 Apr New Technology Does Not Replace Craftsmanship

WorkshopTechnology certainly has an incredible impact on any industry, the metal fabrication industry is the same and technology can definitely benefit.

Even when using the latest and greatest in steel technology, here at Rowtec we take great pride in our craftsmanship and quality. We back that claim in the undercurrent of both our company mission and vision statement. Our mission, in short, is the never-ending pursuit toward improvement. Our vision, summarized, is about being the absolute best company in our industry.

We believe that using great technology allows us to provide competitive and efficient fabrication for steel, aluminium, stainless steel and other materials but craftsmanship and quality make our work stand above others in the industry.

We take great pride and care in every project we undertake. Customer satisfaction plays a big role when planning and creating our client’s visions and we take the client through every step of the process.

Rowtec has been up and running for 19 years but we never stop learning in this industry and are always looking for new ways to achieve the desired outcome. We make sure that we perfect every job to the highest of standards and give our client’s our word to provide that every time. Because of this expectation, we still have client’s today that have worked with Rowtec since the beginning!

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11 Mar What does ‘No Deal’ Brexit mean for Steel Industry?

A ‘No-Deal’ Brexit leaves UK Steel Industry VulnerableSteel Stock

The EU has introduced a series of tariffs to prevent steel “dumping” from China, Russia and other countries.

The employers’ organisation, UK steel, said a new regime for policing this would be unlikely to be fully in place by March when the UK leaves the EU, leaving British steel vulnerable. The UK government said the industry would have “appropriate protections”.

Around 8,000 people are directly employed in the Welsh steel industry, including Tat on Deeside and more that 4,000 in Port Talbot – which is the largest steelworks in the UK. UK steel has told the UK government that steel enjoys more EU safeguarding measures than any other industry, following a crisis in the industry that saw prices plummet and job losses. Those measures have seen steel prices increase and greater job security.

UK steel said any gap in the coverage of these measures as a result of ‘No Deal’ in the Brexit negotiation would “very quickly be taken advantage of by foreign exporters and would undermine the UK steel sector at a critical time in its recovery”.

The concerns over a ‘No Deal’ Brexit are echoed by the steelworker’s union, community.

“If we leave the customs union, we are concerned the UK will have amongst the weakest trade defence systems in the world and our industry will be newly exposed to steel dumping from countries like China.”

UK steel also wants the UK government to adopt all the protection measures put in place by the EU after Brexit but is concerned about whether this is possible either legally and politically.

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Galv

22 Feb The Galvanizing Process

Hot dip galvanizing is the process of coating iron or steel with a layer of zinc by immersing the metal in a bath of molten zinc at a temperature of around 842°F (450 °C). During the process, a metallurgically bonded coating is formed which protects the steel from harsh environments, whether they be external or internal.

Galvanized steel is widely used in applications where corrosion resistance is needed without the cost of stainless steel and can be identified by the crystallised pattern on the surface (often called a ‘spangle’). Galvanizing is probably the most environmentally friendly process available to prevent corrosion.

hot-dip-galvansing-processThe galvanizing reaction will only occur on a chemically clean surface. In common with most zinc coating processes, the secret to achieving a good quality coating lies in the preparation of the surface. It is essential that this is free of grease, dirt and scale before galvanizing. These types of contamination are removed by a variety of processes and common practice is to degrease first using an alkaline or acidic solution into which the component is dipped. The article is then rinsed in cold water to avoid contaminating the rest of the process. The article is then dipped in hydrochloric acid at ambient temperature to remove rust or mill scale. Welding slag, paint and heavy grease will not be removed by these cleaning steps and should be removed by the fabricator before the work is sent to the galvanizers. After further rinsing, the components will then commonly undergo a fluxing procedure.

This is normally applied by dipping in a flux solution – usually about 30% zinc ammonium chloride at around 65-80°C. Alternatively, some galvanizing plants may operate using a flux blanket on top of the galvanizing bath. The fluxing operation removes the last traces of oxide from the surface and allows the molten zinc to wet the steel.

Post Treatment

Post galvanizing treatment can include quenching into water or air cooling. Conditions in the galvanizing plat such as temperature, humidity and air quality do not affect the quality of the galvanizing coating.

By contrast, these are critically important for good quality painting. No post treatment of galvanized articles is necessary and a paint or a powder coating may be applied for enhanced aesthetics or for additional protection where the environment is extremely aggressive. Chemical conversion coatings and other barrier systems may be applied to minimise the occurrence of wet storage stain.

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evergreen tree

13 Dec How Does The Weather Impact Structural Steel?

 

evergreen treeWhen metal and water combine, it usually results in rust, which is what many people might worry about when they th

ink about their steel structure in the rain. At Rowtec we are here to ease your stress. An engineered metal building from Rowtec is made of high-quality materials, so you don’t have to worry about little things like rust. In this post we will discuss little things you can do to help your metal building survive this ever-changing English weather.

Rain and an Engineered Metal Building

Much like your home, the best way to protect your engineered metal building from rain is to add gutters to your steel building. By adding gutters, you divert the water away from the building and you don’t have to worry about unnecessary leaks or rust.

Lightning and Other Storm Related Weather

Everyone is familiar with the dangers of being outside during a lightning storm: the biggest warning being that lighting is attracted to metal. So why would anyone want a metal building during a storm then, right? Actually, when struck by lightning, an engineered metal building is designed to disperse the heat and electricity from the strike into the ground. This means that you, your family, and anything else inside the steel building will be safe from harm!

If you are wondering whether a steel building could survive more extreme weather conditions, such as hurricanes, the simple answer is yes. Engineered metal buildings that have been built correctly can withstand great forces of wind and don’t bend under pressure.

Snow

If you live in a climate that gets a lot of snow, there are a few things you should consider when it comes to your engineered metal building. Luckily for you, snow damage is easy to prevent. When you are designing your steel structure or reviewing the options to buy, you want to keep in mind that simple roof structures will be beneficial during the winter months. A complex roof design might collect snow in unwanted areas until the sun can do its job and melt it. This could lead to rust which is something you definitely don’t want.

Another suggestion is to plant a few evergreen trees on the windy side of your building. Evergreens blossom all year round and by planting them on the windy side of your steel building, you are creating a natural barrier against those harsh winter winds. Plus, planting trees is good for the environment so it’s a win-win!

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Welding in hollow section

30 Nov Looking For Structural Steelwork Suppliers

Welding in hollow sectionEven though all steelwork suppliers promise to deliver reliable services, not every company is a true expert in what they are doing. There are surprising things you might not know about them that can help you choose a supplier that offers services at par with the latest standards and specifications.

  • CE Marking – (‘Conformite Europeene’ which means ‘European Conformity’)

In July 2014, steelwork manufacturers were introduced to a new regulation that meant every structural steel fabricator has to have an accreditation that allows them to CE mark their products. It covers every product that is sold for structural properties.

However, companies in the UK have been very slow to implement this regulation and many seemed to hope to continue working without it. From over 9,000 fabricators in the country, only 5% has the CE marking accreditation, and here at Rowtec we are proud to say that we are part of that percentage.

  • Construction Products Regulation

The CPR is another European regulation that covers work in the UK. This regulation aims at improving the reliability of information, which is pf interest to consumers, contractors, and public authorities. The CPR has been developed according to the European Product Standards and Technical Assessments and uses unified assessment methods.

Any company that works with steel, such as structural engineers, component manufacturers, and structural steelwork suppliers should be aware of this regulation.

  • Corrosion Protection

Rust is an iron red oxide that is formed over time by the oxidation reaction of oxygen and iron. It rapidly appears in the presence of air, moisture, and water. Without quality corrosion protection, steel will rust due to these conditions. The amount of rust depends on the severity of environmental factors.

There are different protective methods, such as plastic or paint coating but they are old- fashioned and have drawbacks. For example, when a section of steel gets damaged, the coating will fall away, and this section will become rusty. It happens quite often, which makes these types of protection unreliable. A hot zinc spray treatment ensures that steel, which is exposed to damage isn’t compromised by rust.

  • Local Companies

Choosing to work with the local suppliers instead of a huge chain has many benefits and some may even surprise you. For example, even though may companies offer good service, they can’t do any better than a local owner can with a personal touch.

Local suppliers can offer products that are suitable for your area, your business, and local requirements. This is when you can actually find what you want rather than what a huge chain wants to sell you. It’s also worth mentioning that local suppliers develop their services based on local customers rather than fashionable trends.

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