1, With the power supply of vertical external characteristic, positive polarity is operated when using DC (negative polarity while welding wires).

 

2, Generally suitable for the welding with thin sheet less than 6mm. It processes the advantages of fine welding appearance and less distortion.

 

3, Argon of 99.99% purity serves as its protective gas. The argon flow is 8 ~ 10L / min under welding current of 50 ~ 150A and 12 ~ 15L / min under welding current of 150 ~ 250A.   

 

4, The length of tungsten electrode that protruds the gas nozzle should be less than 4 ~ 5mm. When in less covered palces, say doing fillet welding, the length is advised to be 2 ~ 3mm while in deep slotted places the length is better to be 5 ~ 6mm. Worker should stand away from nozzle within 15mm.

 

5, To prevent welding port, rust and oil on the welding joint should be cleaned up in time.

 

6, When welding ordinary steel, the arc length is advised to be 2 ~ 4mm; while welding stainless steel, the length should be kept within 1 ~ 3mm for a long length will reduce the protection effect.

 

7, In the case that the back of the bottom weld bead is oxidized, it should be put into operation with protection gas.

 

8, In order to have a good match between argon and the weld pool and to facilitate the welding operation, the angle between the workpiece and the center line of tungsten electrode should generally be maintained within 80 ~ 85 °. And the angle between the filler wire and the surface of the workpiece should be as small as possible at about 10 °.

 

 

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