Argon arc is a kind of operation with both left and right hands at the same time, which is the same as drawing a circle with the left hand and drawing a square with the right hand in our daily life. Therefore, it is suggested to conduct similar training for those who just start to learn argon arc welding, which will be helpful to learn argon arc welding.

(4) welding: after arc ignition, the welding parts should be preheated at the beginning of 3-5 seconds, and wire feeding begins after the formation of molten pool.  When welding, the Angle of the welding wire gun should be appropriate, and the welding wire should be fed evenly.  Welding gun moving forward to smooth, left and right swing is a little slower, the middle is a little faster.Pay close attention to the change of molten pool, pool molten pool becomes larger, weld width or concave, to speed up the welding speed or adjust the welding current.  When the fusion pool is not good and the wire feeding is immovable, the welding speed should be reduced or the welding current should be increased. If it is bottom welding, the attention should be focused on the two sides of the edge of the groove, and the corner of the eye should be on the opposite side of the seam, and pay attention to the change of the rest of the height.

5) arc closing: if the direct arc closing is easy to produce shrinkage hole, if there is an arc starting welding gun to intermittent arc closing or adjust to the appropriate arc closing current slow arc closing, if there is no arc starting welding machine will slowly lead the arc to the side of the groove, do not produce shrinkage hole, such as shrinkage hole to be polished clean before welding.

If the arc is in the joint, the joint should be polished into a inclined mouth, until the joint is fully melted and then forward welding 10-20mm and then slowly arc, can not produce shrinkage.  In production often see the joint is not polished into a bevel, directly lengthen the joint welding time for joint, this is a very bad habit, so that the joint is easy to produce concave, joint fusion and negative disjunction affect forming appearance, such as high alloy material is also easy to crack.