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The main cause of pores in aluminum and aluminum alloys

The main cause of pores in Aluminum Mig Wire
1. Air intrusion into the arc and molten pool area
(1) The amount of protective gas is too large or too small;
(2) The protective gas nozzle is too small or the condition is too bad;
(3) The inclination angle of the welding torch is too large or the distance of the welding torch is too large;
(4) The extension end of the welding wire is too long or the conductive tip is bent;
(5) Blockage or leakage of the protective gas pipeline;
(6) drafts;
(7) arc offset;
(8) The arc is too long;
(9) The arc is unstable (wire feeding is unstable).
2. Gas-like substances are produced in the molten pool
(1) Melted segregation zone;
(2) Improper matching of welding wire and shielding gas;
(3) Wrong layout of welding layer structure;
(4) The welding torch swings too much and the molten pool is too large;
(5) The spot welding parts are not polished and welded directly.
3. Welding torch failure
(1) The cooling water system is poorly sealed;
(2) The shielding gas outlet hole is blocked;
(3) The protective gas nozzle is poor or improperly matched;
(4) The position of the contact tip is wrong.
4. Surface defects of workpiece and welding wire
(1) The surface of the workpiece or welding wire is damp (crystal water, etc.), rusty, dirty paint, grease, water and welding slag;
(2) The surface of the welding wire or the workpiece has a metal coating with a low boiling point such as lead, zinc and cadmium.
5. Improper selection of welding parameters: arc voltage is too high, etc.
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