Welding

The big advantage of acetylene lies in the reducing effect of the weld­ing flame, which is easy to adjust as well as to control. Gas welding with acetylene is characterized by good gap-bridging capabilities. There is no, or very little, joint preparation required. The problem-free application is particularly useful in out-of-position welding.

In pipeline construction, for instance, where other welding methods are usually out of the question or not economical, the oxy-acetylene flame is the welder’s reliable and true friend. Combustion of acetylene with oxygen is characterized by a sharply defined flame cone.

We have developed a RAPID PROCESSING® concept for high productivity MAG welding, which creates better productivity as a consequence of higher welding speed and/or greater deposition rate. It also decreases less spatter and weld surface slag, better side penetration and smoother weld reinforcements. The technique is eminently suitable for welding non-alloy and low-alloy steels with thicknesses above 1 mm and can also be used on stainless steels. For the best results, unconventional welding parameter settings are used together with an argon-rich MISON® shielding gas, which provides greater productivity and a better working environment.

Plasma arc technique is reminiscent of TIG welding, where electric arc burns between a tungsten electrode and the work piece. The most important difference is that the arc in plasma welding is forced through a restriction in the form of a water-cooled nozzle. The greatest advantage of plasma welding is visible on 2 to 8 mm plates with ‘key-hole’ technique, which involves a powerful plasma arc melting a hole through the plate. When the burner is moved forward, material is also melted in front of the hole. This material is forced towards the back of the hole by the arc pressure, where it moves together due to surface tension and solidifies. A homogenous weld is created and complete full-penetration welding is attained.

Depending on which gas is used, the shielding gas can have a clear effect on the arc energy. Normally, shielding gas and plasma gas is the same. A root protection gas protects the molten weld pool and the area affected by the heat on the root side of the weld.

TIG welding method is most often used for welding thin materials (~ 0,3–3 mm). The heat source is an electrical arc that is generated between the work piece and the tungsten electrode. The pool and the electrode are protected by a shielding gas which flows from a gas cup in which the electrode is centrally placed. The shielding gas protects the electrode, the weld pool and the heated material against the damaging effects of air and also affect the properties of the arc (e.g. the energy) and the appearance of the weld, as well as productivity and working environment.

An inert gas such as argon, helium or a mixture of the two is most commonly used as shielding gas. Occasionally, hydrogen and/or nitrogen are added in low concentrations. The welder must also be protected against toxic gases and welding fume. MISON® shielding gases protect both the welder and the weld by reducing the emission of damaging ozone

The method is very similar to MIG / MAG welding. The biggest difference is the addition material melting point, since the base material does not melt at MIG brazing. Heat input in MIG brazing is considerably less than in MIG / MAG welding, therefore is MIG brazing particularly suitable for welding of zinc coated sheets in such areas as the automotive industry. Argon is often used although small amounts of carbon dioxide and oxygen can be added to improve productivity and properties.

In pipeline construction, for instance, where other welding methods are usually out of the question or not economical, the oxy-acetylene flame is the welder’s reliable and true friend. Combustion of acetylene with oxygen is characterized by a sharply defined flame cone.

MIG (metal inert gas) and MAG (metal active gas) welding methods are widely used in Western Europe, the United States, and Japan due to their high productivity and ease of mechanization. In MIG/MAG welding, filler metals in the form of solid wire or tubular-cored wire electrodes are melted off continuously in an electric arc generated by a welding power source. The arc and molten weld pool are protected by shielding gases, either inert (e.g., argon, helium) or active (e.g., argon/carbon dioxide, argon/oxygen), which optimize the welding process and properties of the finished product. We offer MISON® shielding gases for optimal welding applications and emphasizes safety measures for welders, including good ventilation and protection against ozone emissions. Safety instructions for working with extreme heat and shielding gases are also provided.

In pipeline construction, for instance, where other welding methods are usually out of the question or not economical, the oxy-acetylene flame is the welder’s reliable and true friend. Combustion of acetylene with oxygen is characterized by a sharply defined flame cone.

Laser welding is gaining popularity in industrial applications. High productivity and quality are contributing factors to the increased use. Examples of applications are welding of automotive components, transmission parts, heat exchangers and tailored blanks. Lasers are also used for welding of medical equipment and lately, also battery components. The CO2 lasers are now often replaced by multiple kilowatt fibre and diode lasers enabling the possibility to guide the laser beam via optical fibres in combination with robots for 3D applications. The laser beam is focused on the metal to be joined causing the material to melt and in some cases vaporize. The welding process is performed as heat conductive or key-hole welding depending on the need for penetration and weld width. Heat conductive welding can be utilized using CO2-, fibre and diode lasers. Deep penetration welding, also known as key-hole welding often demands high laser power (multi kilowatt). Fibre and CO2 lasers are used for this application.

Welding gases protect the weld pool, optics, and control plasma formation. Some gas mixtures also interact with the molten metal, improving productivity and weld quality. Our LASERLINE® gases offer optimal solutions for all processes.