Lasaco TIG welding machines: quality without compromise for every need
In addition to the first-class products of our cooperation partner Lorch, we can offer you an unbeatable price-performance ratio in the field of TIG welding with machines of our excellent own brand BlackLine.
How does TIG welding work and where is it used?
TIG stands for tungsten inert gas and is one of the fusion welding processes with an arc. Unlike other fusion welding processes, TIG welding produces virtually no spatter. This not only allows the weld seam to be drawn very precisely and cleanly, but also results in far fewer health hazards due to welding fumes. TIG welding technology can be used to process virtually any material that is suitable for fusion welding. This also includes metals such as aluminum as well as alloys that cannot be welded with other processes, or only to a limited extent.
TIG has a number of advantages over other processes in terms of application. For example, the distortion of workpieces is significantly lower due to the very limited heat input. In addition, the TIG process is also suitable for welding in constrained positions and for so-called root passes. Typical areas of application are pipeline and apparatus construction, power plant construction or aerospace engineering. But the TIG welding process is also regularly used in the chemical industry and in bicycle frame construction. Due to the high quality of the weld seams, the welding technology is in demand everywhere where speed is less important than perfect appearance and quality.
Automated TIG welding with our Cobot
The LorchWeldingPackage TIG combines the advantages of cobot welding with TIG technology. Thus, even demanding welding tasks can be automated. With our Cobot solution, we offer a perfect system for welding automation in medium-sized companies that increases productivity while delivering outstanding quality with spatter-free welds.
Suitable shielding gases for TIG
Since TIG is a so-called shielding gas welding process, the question of suitable gases is also a matter of economic efficiency. In order to reduce costs, the noble gas argon 4.6 is mostly used for TIG welding nowadays. The somewhat more expensive helium is recommended when a higher thermal conductivity of the shielding gas is required to increase the heat input. For welding non-rusting austenitic steels, the viscosity of the melt can be reduced by admixing small quantities of hydrogen. This allows the welding speed to be increased, but technically it is then no longer an inert gas.
Voltage sources and polarity in TIG welding
In the TIG welding process, a distinction is made between DC and AC welding. AC welding is mainly recommended for light metals such as magnesium or aluminum, although aluminum and other light metals can also be welded using the DC process under certain circumstances. In that case, however, a positive electrode must be used. This polarity of the tungsten electrode is necessary because aluminum and magnesium form oxide layers with a very high melting point, which are broken up by the negatively poled workpiece. The tungsten electrode must then be particularly thick. Helium should also be used as a shielding gas. If aluminum, magnesium or similar light metals are not to be used, DC welding is always performed with a negatively poled electrode. This process can be used to weld all types of steel, non-ferrous metals and corresponding alloys.
Pulsing with TIG welding technology
In addition to classic welding, so-called pulsing has become established as an alternative in the TIG process. This uses pulsating current that delivers precisely adjustable pulses and a very stable arc. This allows the heat input to be controlled very precisely, for example to bridge gaps. Pulse welding also offers advantages when used in root passes and constrained positions. The occurrence of weld defects at the beginning and end of the welds is greatly reduced. However, a welding inverter is required for so-called TIG pulsing with variable current progression. For light metals such as aluminum, pulse welding offers the particular advantage that only the surface is melted. This allows extremely thin sheets to be welded without the risk of melting through.
TIG welding questions and answers
Is TIG suitable for welding of cast iron?
In principle, TIG welding of cast iron is possible. However, the high carbon content can lead to increased cracking due to embrittlement and hardening.
What shielding gas is used in TIG?
Argon with a purity of at least 99.95 percent is the most commonly used shielding gas. Metals with high thermal conductivity can also be welded with helium, as the arc then reaches higher temperatures. This effect is used, for example, when welding aluminum or copper.
How does the TIG welding process work?
The current for generating the arc is supplied via a tungsten electrode in the TIG process. Tungsten is particularly temperature-resistant and does not melt. The arc heats the material until it liquefies. Shielding gas flows through a nozzle onto the work area to protect the material from undesirable chemical reactions (e.g. oxidation). This allows the weld seams to be produced to a particularly high quality.
For what materials is TIG welding suitable?
The welding technique can be applied to almost all materials suitable for fusion welding. These include:
Copper and copper alloys
Aluminum and aluminum alloys
Austenitic CrNi steels
Unalloyed and low-alloy steels
What are the advantages of the TIG process?
It is suitable for all weldable metals, forms very clean and high-quality welds, works with a non-melting tungsten electrode and forms virtually no slag thanks to inert gas. Machined materials show hardly any distortion or deformation. In addition, TIG welding is suitable for all positions.
What are the disadvantages of the TIG process?
The energy requirement is relatively high. In addition, TIG is susceptible to wind, so it is not suitable for outdoor applications. The comparatively high initial investment is often a deterrent, but this is offset by the high quality of the results.
How do you find the optimum welding process for your material?
|Alloyed steels, non-ferrous metals
|All steels, light metals, glass
|Stud welding (tip ignition)
|Carbon steel, stainless steel, brass
|Stud welding (drawn arc)
|Unalloyed steel, stainless steel