TIG welding is the method used when maximum precision, clean weld seams and maximum control over the welding process are required. Companies that work with demanding materials or sensitive components in particular therefore rely on the TIG welding process. Schnelldorfer Maschinenbau tells you how TIG welding works technically and also shows you the advantages and disadvantages of the process and what is important when it comes to equipment. Everything you need to know about TIG welding: process, advantages and applications.
Basics of TIG welding
TIG stands for tungsten inert gas welding and is now one of the most important welding processes. TIG welding uses a non-melting tungsten electrode. In contrast to MIG, for example, the filler material is added separately to the weld pool as required. This allows the heat supply to be controlled particularly finely, which makes the TIG welding process so precise. The process therefore shows its strengths above all when a clean surface and at the same time high strength with exact seam tracking are required. TIG welding is often the preferred method for thin workpieces and visually demanding components in particular.
How welding works in detail
In the TIG welding process, the arc burns between the tungsten electrode and the workpiece. The resulting heat melts the base material locally, creating a controllable weld pool. At the same time, shielding gas, usually argon, flows out of the torch nozzle and protects the electrode, the weld pool and the welding point from oxygen in the ambient air. This prevents the highly heated materials from oxidizing or becoming contaminated.
This is precisely where the many advantages of this process become apparent: TIG welding produces hardly any weld spatter, there is no slag, the weld seams are very clean and the surface often remains so high quality that only little reworking is required. Direct current is usually used for stainless steel, whereas alternating current is generally used for aluminum due to the oxide layer. As a result, control over the entire welding process remains high - as does the seam quality.
Advantages of TIG welding at a glance
- Very precise welding process with finely controllable heat supply
- Particularly suitable for thin workpieces
- Ideal for optically demanding components
- Clean surfaces and precise seam tracking
- High strength of the weld seams
- Controllable melting bath for clean working
- Hardly any welding spatter during welding
- No slag formation
- Often only little rework necessary
- High level of control over the entire welding process
Materials and tungsten electrodes for TIG welding
The TIG welding process is suitable for almost all weldable metals, making it one of the most versatile welding processes available.
It is used particularly frequently for the following materials:
- Stainless steel
- Aluminum
- Low-alloy and high-alloy steels
- Copper
- Titanium
- Nickel alloys
Good preparation for good results
When welding, the preparation often determines whether the result is convincing or not. You should therefore check the functionality and cleanliness of the welding machine, the gas supply, the earth connection, the electrode and the surface of the workpiece before each use. Even small errors or deviations have a direct effect on the subsequent weld seams and the overall performance.
The basic settings are just as important, because everything has to match the selected process, from the amperage to the gas flow. A clean joining surface is also essential for TIG welding: no oil, no rust, no residue on the surface, as impurities quickly have a negative effect on the weld pool, especially with stainless steel and aluminum. A good seam also requires smooth and even guidance.
TIG and MIG/MAG in comparison
Alongside TIG, MIG/MAG is one of the most important welding processes in industrial practice - although both have different strengths. TIG welding is particularly impressive when it comes to maximum precision, clean weld seams and a particularly fine seam appearance. MIG/MAG welding, on the other hand, is designed for high speed and high quantities. Although this makes this welding process less precise, it is significantly more economical because the work can be carried out more quickly.
Quality of the weld seam: TIG welding produces a very clean result with a particularly fine seam appearance. MIG/MAG welding produces a solid seam appearance, usually with more spatter.
Accuracy during welding: TIG welding offers very high control and precise work. MIG/MAG welding achieves good precision for many standard applications.
Working speed: TIG welding works at a rather moderate speed. MIG/MAG welding is significantly faster.
Typical input materials: TIG welding is mainly used for stainless steel, aluminum and titanium. MIG/MAG welding is mainly used for steel and structural steel.
Control of the heat supply: In TIG welding, the heat input is very targeted and finely adjustable. With MIG/MAG welding, the heat input into the workpiece is stronger.
Common mistakes and challenges with TIG
- Porosity: Often caused by problems with the shielding gas or contamination on the workpiece. Checking the gas supply and a thoroughly cleaned surface are helpful.
- Unsteady arc: Often indicates an incorrectly prepared tungsten electrode, poor gas coverage or unsuitable settings.
- Discoloration: Usually indicates excessive heat input or insufficient shielding gas effect.
- Uneven weld seams: Often caused by unsafe torch guidance or fluctuating amperage.
- Inclusions: Can usually be traced back to contaminated gases or an unclean workpiece surface.
- Material distortion: Caused by excessive heat input. It makes sense to apply as little heat as possible per cycle, use clamping devices and a well thought-out welding sequence.
- Fluctuating seam quality: Should be detected and checked at an early stage. In addition to visual inspection, dimensional checks and, in the case of safety-relevant components, non-destructive tests are also important.
Get the best out of TIG with the LINEARWELD series
With the LINEARWELD series, Schnelldorfer Maschinenbau helps you to get more out of every work step in TIG welding. The tried-and-tested systems are designed in such a way that they can be used flexibly in operation. Thanks to their modular concept, they are suitable for a welding range of up to 15 mm and can process workpieces with a maximum length of 4,100 mm. Not only stainless steel, aluminum and steel can be processed safely, but also copper, brass and even various special alloys.
You can also integrate different welding processes - including high-performance TIG. The modern control technology in combination with the low set-up effort and the stable frame construction quickly create reproducible and clean processes in day-to-day work. And because that's not enough, the documented parameters create an all-round reliable basis for consistent quality.
At Schnelldorfer Maschinenbau, we are always at your side: In addition to welding machines, we offer you service at eye level and training courses that introduce your employees to working with the machines step by step. We also provide spare parts and maintenance for many years to come. For a contact partner who combines reliable services and strong results in the long term.
Successful TIG welding process with Schnelldorfer Maschinenbau
We at Schnelldorfer Maschinenbau know this: A successful TIG welding process doesn't just start at the torch, but with the choice of the right technology. That's why we provide you with impressive systems and service from experts with many years of experience and a clear view of your requirements. This is how we develop your personal welding solution for clean results and a performance and quality that will leave you satisfied.
Don't hesitate and contact us now for advice: We will be happy to assist you from the initial inquiry through to long-term support in your day-to-day operations. For welding systems that pay off.
Frequently asked questions (FAQ)
What is the TIG welding process?
The TIG welding process is a welding process in which an arc burns between a non-melting tungsten electrode and the workpiece. The shielding gas, usually argon, protects the weld pool and electrode from the ambient air.
What are the advantages of TIG welding?
The most important advantages include clean weld seams, hardly any welding spatter, high precision and excellent control over the entire welding process. This makes the process particularly suitable for stainless steel, aluminum and visible seams.
What are the disadvantages of the TIG welding process?
The main disadvantages are the lower speed, the higher demand on skilled workers and the somewhat more complex handling. The complexity is also higher than with some other welding processes. However, with the right, trained handling, the process often pays for itself quickly.
What materials is TIG welding suitable for?
TIG welding is suitable for many materials and metals, including stainless steel, aluminum, copper, titanium, nickel alloys and various steels. TIG shows its strengths particularly with thin workpieces and high-quality surfaces.
Why is argon so important for TIG welding?
Argon is the most commonly used shielding gas because it reliably protects the arc, the weld pool and the electrode from oxygen. This improves the seam quality and reduces defects such as porosity or discoloration.
What are web applications in welding operations?
Web applications are digital solutions that are used via the browser and run on a server. In welding, they help to record data centrally, document processes and provide information for various areas of the company.
What are the advantages of web applications for TIG welding?
Web applications create more transparency, facilitate access to important information and reduce sources of error. They also improve efficiency because checklists, work instructions, parameters and protocols are available quickly and centrally.
For which companies are web applications particularly worthwhile?
Companies with several workstations and several machines benefit from this in particular. Here, the applications significantly simplify collaboration by providing a better overview of ongoing processes.
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