TIG Welding/TIG Stainless Steel Welding
The arc is generated between the refractory tungsten welding wire and the workpiece. The generally used shielding gas is pure argon, and the fed wire is not charged. It can be sent by hand or mechanically (during TIG stainless steel welding). For some specific uses, the fed wire doesn’t need to be sent. The material to be welded determines whether to use direct current or alternating current: when using direct current, the tungsten electric welding wire is set as the negative pole, because it has deep penetration ability, it is very suitable for different kinds of steel, but it is not suitable for weld pool. Doesn't have any "cleaning action".
The main advantage of the TIG welding method (TIG stainless steel welding) is that it can weld a wide range of large materials, including workpieces with a thickness of 0.6mm and above. The materials include alloy steel, aluminum, magnesium, copper and its alloys, gray cast iron, ordinary dry, various bronzes, Nickel, silver, titanium and lead. The main field of application is as a root pass on thicker sections for the welding on workpieces with thin and medium thickness.
Key points and precautions for TIG stainless steel welding:
(1) The power supply with vertical external characteristics adopts positive polarity (the welding wire is connected to the negative pole) when it is DC.
(2)It is generally suitable for welding on thin plates below 6mm. It has the characteristics of beautiful weld shape and small welding deformation.
(3)The protective gas is argon with a purity of 99.99%. When the welding current is 50~150A, the flow rate of argon gas is 8~10L/min, when the current is 150~250A, the flow rate of argon gas is 12~15L/min.
(4)The protruding length of the tungsten electrode from the gas nozzle is preferably 4~5mm, 2~3mm in places with poor shielding such as fillet welding, and 5~6mm in places where the groove is deep, and the distance from the nozzle to the work is generally not more than 15mm.
(5)In order to prevent the appearance of stainless steel welding pores, if there is rust and oil stains on the welding parts, it must be cleaned.
(6)The welding arc length is preferably 2~4mm when welding ordinary steel, and 1~3mm when welding stainless steel. If it is too long, the protection effect will not be good.
(7)During butt priming, in order to prevent the back side of the bottom weld bead from being oxidized, the back side also needs to be protected by gas.
(8)In order to make the argon gas well protect the welding pool and facilitate the welding operation, the center line of the tungsten electrode and the workpiece at the welding point should generally maintain an angle of 80~85°, and the angle between the filler wire and the surface of the workpiece should be as small as possible, generally about 10°.
(9)Windproof and breathable. Where there is wind, please take measures to block the net, and take appropriate ventilation measures indoors.
Please feel free to contact us for TIG steel welding or TIG stainless steel welding.
