11 Nov 2021
With the development of science and technology, the application of argon tungsten arc welding machine is becoming more and more extensive, not only used in stainless steel sheet welding, pure copper welding, long-distance pipeline bottom welding, stainless steel thin skin pipe welding, thermal instrument pipe fittings, transformer welding Forming is also used in welding processes such as air missile processing, submarine pipeline high-pressure welding, dissimilar steel welding, and stator core production. Why is TIG welding so widely used? Let's learn about argon tungsten arc welding together!
The first thing to know is what is TIG welding? Let’s interpret it from the definition. TIG welding uses a high melting point tungsten rod as the electrode. Under the protection of argon laminar flow, it relies on the arc generated between the infusible tungsten rod and the weldment to melt the base metal and fill it. A welding method of welding wire (if filler wire is used). It uses the argon sprayed from the nozzle to form a continuous closed air flow around the electrode and the welding pool to protect the tungsten electrode and the welding pool from being oxidized, and to avoid the harmful effects of air on the molten metal (Figure 1). At the same time, since argon is an inert gas, it does not chemically react with molten metal and does not dissolve in metal. Therefore, the welding quality of argon tungsten arc welding is relatively high. Tungsten argon arc welding is suitable for manual or automatic operation, and can be used for continuous welding, intermittent welding (sometimes called'skip welding') and spot welding. Because the electrode rod is non-consumable, it does not need to be added Fill metal and only fuse the base metal for welding. However, for individual joints, it is also necessary to use filler metal according to its needs.
Knowing what is argon tungsten arc welding, what are its advantages? Let us list the advantages of argon tungsten arc welding one by one. The first one is high quality welds. Since argon gas can effectively isolate the surrounding air, and it is also an inert gas, and does not cause any chemical reaction with metal; the filler wire is heated indirectly by the arc, because the tungsten electrode itself does not produce droplet transfer, so the arc length change interference factor is small, Even in the case of a small current, it can still burn stably. There is no spatter in the welding process, and the weld seam is beautifully formed. Second, the welding stress and deformation are small. Because the heat of argon arc welding is concentrated and the temperature of the arc column is high, the heat affected zone is narrow; in addition, the heat source and filler wire can be controlled separately, and it has the pulse welding function, which is easy to adjust and control the welding heat input, so the weldment stress, deformation and cracks Small inclination, suitable for welding thin plates or heat-sensitive materials. The third is a wide range of weldable materials. TIG welding can weld almost all metals and alloys. Moreover, the arc has a cathode cleaning effect during the welding process, and the metallurgical reaction of the molten pool is simple and easy to control. Therefore, some refractory metals and easily oxidized metals, such as titanium, molybdenum, aluminum, magnesium, etc. and their alloys, can be successfully welded without using flux. And stainless steel, heat-resistant steel, etc. Fourth, the operation technology is easy to master. Because it is an open arc, the arc and the molten pool can be observed, so the arc is stable during the welding process, no slag removal is required, and it is suitable for all-position welding. At the same time, since the electrode loss is small and the arc length is easy to maintain, it is easy to realize mechanization and automation.
After talking about the advantages, let's also talk about the disadvantages of argon tungsten arc welding. The first one is shallow penetration, low deposition speed and low production efficiency. Second, the protective effect of the inert gas is greatly affected by the surrounding airflow during welding, and wind-proof measures are required. The third is to have high requirements on the surface condition of the workpiece. The oil, rust and oxide film on the surface of the workpiece should be carefully cleaned before welding, otherwise defects such as pores are likely to occur. Fourth, the tungsten electrode's ability to carry current is poor, and excessive current is likely to cause pollution (tungsten clamping). Fifth, inert gases (argon and helium) are more expensive, which is more expensive than other arc welding methods. Sixth, the high ionization potential of argon gas makes it difficult to start the arc, and it is necessary to use high-frequency arc ignition and arc stabilization devices. Seventh, argon arc welding is more harmful to humans than electrode arc welding. The current density of argon arc welding is large, the light emitted is relatively strong, and the ultraviolet radiation generated by the arc is 5 to 30 times that of ordinary Hana arc welding, and the infrared is 1 to 1.5 times that of electrode arc welding. Ozone generated during welding The content is also high, so you should try to choose a place with better air circulation for construction, otherwise it will cause great harm to the body.
The argon tungsten arc welding machine produced by our Kingsiri is a high-quality, technologically innovative welding machine. The use of high-tech technology has greatly avoided the shortcomings of general argon tungsten arc welding, and tried our best to embody the advantages of argon tungsten arc welding. Use our Kingsiri tungsten arc welding machine, which is easy to use, high work efficiency, good welding effect, beautiful welding seam, you deserve it!
Keywords: welding machine
Originally published 11 Nov 2021, updated 11 Nov 2021.