Specialised Welding Services
We can now offer specialised expert welding at Nexus 4X4 anything from…..
Titanium, Stainless, Alloy, Mild Steel and more.
Aluminium is one of the most popular materials to use for welding, and there are several good reasons for that. Being thin, it’s incredibly lightweight, but it’s still very strong and resilient. Pure aluminium has a melting point of around 1220ºF (660ºC), and it’s highly conductive of both heat and electricity.
Furthermore, aluminium can be alloyed with many other metals, which makes them even stronger and more durable.
Aluminium is a lightweight, thin metal which is used very commonly in welding workshops. With this metal, welding has to be done at low temperatures, or else you will just end up blowing holes in your materials. Aluminium is quite reactive, so forms an oxide layer when it’s exposed. This poses an obstacle to welding as it results in porous welds, so you’ll need to scrub the oxide layer off using a wire brush prior to welding. However, you’ll have to work quickly as it will take just a matter of moments to form again.
About Stainless Steel
Stainless steel welding requires a bit more finesse than welding mild steel or aluminum, because heat is an enemy in this process. There are three methods of stainless steel welding which are preferred over the rest by many welders: Metal Inert Gas (MIG) welding, Tungsten Inert Gas (TIG) welding, and Shielded Metal Arc Welding (SMAW) or stick welding. The fumes made from any of these processes are very harmful, and great care must be taken to avoid breathing them.
MIG welding uses a wire containing a flux core along with a shielding gas to make the weld. The shielding gas is commonly 100 percent carbon dioxide or a carbon dioxide and argon mix. This gas prevents oxidation and promotes a stable arc while the flux core of the wire allows stainless steel welding to be performed in all positions. A mixture of 20 to 25 percent of argon with the carbon dioxide will allow a lower heat setting to be used when MIG welding, resulting in a weld with less distortion and discoloration.
TIG welding utilizes a tungsten welding electrode, a filler metal rod and an inert gas to shield the weld. This welding method requires little or no post-weld finishing. The tungsten tip in the welding torch is touched to the material to be welded. This creates an arc that the welder dips the filler metal rod into and allows it to melt into the welding puddle. The shielding gas prevents contamination from entering the weld and allows the weld to flow out smoothly. Heat is controlled through a foot switch.
SMAW welding uses an electrode, or welding rod, coated with chemicals commonly referred to as flux. This coating burns off as the welding rod is melted into the weld joint and shields the weld from contaminates. This method of welding utilizes equipment, which is typically the least expensive. The SMAW weld will require the welder to remove the slag residue from the cooled weld by chipping it away with a hammer and cleaning it with a wire brush.
Stainless steel welding is used in food preparation tables and fixtures, as well as many medical equipment applications. Exhaust fans and special smoke suction tips, which are attached to the welding torch are used when welding to keep the harmful smoke away from the welder. Stainless steel also scratches very easily so great care must be taken to keep debris off of the welding table.
Titanium and its alloys offer excellent corrosion resistance to acids, chlorides, and salt; a wide continuous service temperature range, from –322°F (liquid nitrogen) to 1100°F; and the highest strengthto-weight ratio of any metal. For example, the most widely used grade of titanium alloy, ASTM Grade 5 (Ti-6Al-4V), has a yield strength of 120,000 lb/in.2 and a density of 282 lb/ft³. In comparison, ASTM A36 steel has a yield strength of 36,000 lb/in.2 and a density of 487 lb/ft³, while 6061-T6 aluminum has a yield strength of 39,900 lb/in.² and density of 169 lb/ft³. In short, titanium is about 45% lighter than steel, 60% heavier than aluminum, and more than three times stronger than either of them. While expensive initially, titanium lowers life cycle costs because of its long service life and reduced (or nonexistent) maintenance and repair costs. For example, the Navy replaced coppernickel with titanium for seawater piping systems on its LDP-17 San Antonio Class of ships because it expects titanium to last the entire 40 to 50 year life of the ship. In addition to military applications, other common uses for this light, strong, and corrosion-resistant metal include those for aerospace, marine, chemical plants, process plants, power generation, oil and gas extraction, medical, and sports.
About Mild Steel
MIG welding is an arc welding process in which a continuous solid wire electrode is fed through a welding gun and into the weld pool, joining the two base materials together. A shielding gas is also sent through the welding gun and protects the weld pool from contamination. In fact, MIG stands for “Metal Inert Gas.” The technical name for it is “Gas Metal Arc Welding” (or GMAW), and the slang name for it is “wire welding.”
The MIG process enables the home-hobby, artist, farmer/rancher, motorsports enthusiast or DIY welder to make most types of fabrication and maintenance/repair welds on material from 24-gauge up to 1/2-in. thick. In addition to flexibility, many people turn to MIG welding because they’ve heard that it’s an easy process to learn. Some claim it’s “no harder to use than a glue gun.” While not quite that simple, it is true that most people can become competent MIG welders by following some basic advice.
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