Fusion refers to the phenomenon that the weld metal and the base metal or the weld metal are not completely melted. This defect may cause the weld strength to decrease or even cause fracture.

Countermeasures:
Increase the welding current or welding speed to make the molten pool more complete; adjust the welding gun angle to ensure that the heat source is in full contact with the base metal; clean the base metal surface to remove rust, oil, and other impurities.

Causes:
There are many reasons for the non-fusion of welds, such as excessive gas content, unsuitable electrode materials, insufficient working temperature, etc. After determining the cause of the problem, we need to formulate corresponding solutions.

Solutions:
1. Adjust the welding temperature: If the welding temperature is too low, the weld will not be fused. Therefore, we can appropriately increase the welding temperature and control the welding time to ensure that the electrode material can be fully melted.
2. Adjust the welding time: If the welding time is too short, it is also easy to cause the weld to not be fused. Therefore, we need to appropriately extend the welding time to allow the welding material to melt fully, so as to achieve good welding contact.
3. Adjust the welding speed: The welding speed is also an important factor affecting the welding quality. If the welding speed is too fast, the welding material may not be fully melted and the weld may not be fused. Therefore, we should appropriately reduce the welding speed according to the specific situation to ensure that the welding material can be completely hot-melted and form a good weld.

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