Pay close attention to the change of molten pool. When the weld pool becomes larger and the weld becomes wider or sunken, the welding speed should be accelerated or the welding current should be reduced again. When the fusion of molten pool is not good and the wire feeding feels motionless, it is necessary to reduce the welding speed or increase the welding current. If it is backing weld, the attention should be focused on the two blunt edges of the groove, and the corner of the eye is opposite to the weld. Pay attention to other height changes.
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1, argon protection can isolate the adverse effects of oxygen, nitrogen and hydrogen in the air on the arc and molten pool, reduce the burning loss of alloy elements, and obtain dense, splash-free and high-quality welded joints;
2. Argon arc welding has the advantages of stable arc combustion, concentrated heat, high arc column temperature, high welding production efficiency, narrow heat affected zone, and low stress, deformation and crack tendency of welded parts;
3, argon arc welding is open arc welding, which is convenient for operation and observation;
4, the electrode loss is small, the arc length is easy to maintain, there is no flux and coating during welding, and it is easy to realize mechanization and automation;
5. Argon arc welding can weld almost all metals, especially some refractory metals and oxidizable metals, such as magnesium, titanium, molybdenum, zirconium, aluminum and their alloys;