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Analysis and improvement of common welding quality defects (sixth issue)

Author: admin Published Date: 2018/4/16 concern Views: QR code sharing

Surface stomata

1. Phenomenon

During the welding process, the gas in the molten pool did not completely overflow the molten pool, and some of it overflowed, and the molten pool had solidified to form a hole on the surface of the weld.

2.Cause analysis

池 As the windproof measures are not strict during welding, gas is mixed in the pool.

⑵ The welding material has not been baked or the baking does not meet the requirements, the welding wire is not cleaned, and the gas itself enters the molten pool during the welding process.

⑶ Low melting bath temperature and short solidification time


⑷Welded parts are not cleaned, and impurities generate gas into the molten pool when welding is at high temperature.

⑸The arc is too long, the protective gas flow is too large or too small during gas welding, and the protection effect is not good.

3. Prevention measures

⑴The base metal and welding wire are cleaned up according to the requirements.

⑵The electrode is baked as required.

(3) Windproof measures are strict and there is no cross wind.

⑷Select appropriate welding wire energy parameters. Welding speed should not be too fast. Arc can not be too long. Correctly grasp the operation essentials of arc starting, moving bar, and interest arc.

The gas flow is suitable for the protection of gas flow during radon welding. The purity of the gas meets the requirements.

4. Governance measures

⑴Welding material, base material grinding and cleaning are strictly implemented in accordance with regulations

⑵Strengthen welder practice to improve operation level and operation experience

(3) Weld the welds with surface pores to remove defects and repair welding if necessary.


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