Causes of pores
(1) The base material is unclean; the groove edge is not cleaned properly;
(2) There are large differences in the composition and properties of the welding material and the base material;
(3) Problems with welding shielding gas;
a) The argon pressure in the gas cylinder is insufficient;
b) The welding gas flow is adjusted too large;
c) There is a leak in the gas supply pipe;
d) The argon purity is insufficient, causing harmful gases to mix into the molten pool;
e) The welding arc is too long, resulting in insufficient effective distance of the shielding gas hood;
f) The tungsten electrode extends too long, resulting in insufficient effective distance of the shielding gas hood;
g) The tungsten electrode rolling head or rolling head sleeve is burned by the arc, causing turbulence of the shielding gas flow;
h) The gas outlet of the welding gun is blocked by foreign objects, resulting in poor air flow, resulting in a reduction in the shielding gas flow;
i) Improper wind protection measures, such as: there is a through wind at the welding site, which destroys the shielding gas flow hood. (4) Welding operation problems;
a) The welding gun angle is too large
b) When operating, when using a argon arc welding gun with a control button, the gas is not released before welding, causing the gas flow rate to be too large when the arc is struck;
(5) Welding process problems;
a) The welding speed is too fast;
b) The arc extinguishing method is incorrect;
c) The welding current is not appropriate.
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Preventive measures (1) Clean the surface of the parent material, and remove any residual oil, moisture, rust, etc. on the surface. The groove surface and the 10mm range on both sides of the groove should be polished clean; (2) Select matching welding materials; (3) Problems with welding shielding gas; a) Check whether the bottle valve is fully opened. If it is fully opened, it means that the argon gas in the bottle is insufficient and the bottled argon gas needs to be replaced.; b) Re-adjust the shielding gas flow; c) Check whether the gas supply pipe has leaks; d) The purity of argon gas when welding carbon steel should not be less than 99.7%, when welding aluminum should not be less than 99.9%, and the purity of argon gas used for welding titanium and titanium alloys is as high as 99.99%.; e) Adjust the appropriate welding arc; f) Adjust the tungsten electrode extension length; g) Replace the tungsten electrode ferrule or ferrule sleeve in time; h) Clean the welding gun outlet in time; i) Take windproof measures when the wind speed is >2m/s. When welding pipes, block the pipe opening to avoid the formation of through wind in the pipe. (4) Welding operation problems; a) Adjust the welding gun angle; b) When operating, when using an argon arc welding gun with a control button, release the gas before welding; (5) Welding process problems; a) Adjust the appropriate welding speed; b) When extinguishing the arc, use the method of attenuating the current or adding welding wire to bring the arc to the groove side and suppress the arc. Do not stop the arc suddenly to cause the high-temperature molten pool to break away from the effective protection of the argon gas flow, and avoid the appearance of pores or shrinkage holes in the arc pit.
c) Adjust the welding current to the appropriate parameters. If the welding current is too small, the arc is unstable, and the arc drift is unstable at the end of the tungsten electrode, which damages the protection zone. If the welding current is too large, the arc will disturb the gas flow and the protection effect will be poor.
Post time: Mar-10-2025
