The pores produced by automatic welding
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Without more than ten years of skill, honeycomb-shaped pores cannot be welded.
Visual inspection should be flat plate submerged arc welding. Cause: 1. The butt weld is not provided with a backing plate or the backing plate is too thin and is broken down during the welding process. 2. There is water and combustible materials under the weld or on the back of the steel plate. During the welding process, water vapor evaporates or combustion gas is generated due to high temperature, resulting in a large amount of gas.
Submerged arc welding? ? , Such pores are really rare
:lol:P It’s also my first time seeing you
It’s not surprising if you see people who do this a lot: lol
Add another strip to dry the welding material.
For submerged arc welding, the flux needs to be dried, but because the flux itself is relatively dense and does not absorb moisture as easily as the flux on the electrode, the pores caused by the welding material will not cause honeycomb holes of this size. This is caused by water vapor or the combustion of combustible materials under the floor to produce a large amount of gas. A more detailed analysis shows that the visual defect location is the weld joint. It should be due to low temperature or moisture. The heat of the previous weld "bakes out" the moisture in the steel plate and surrounding areas, and gathers it at the arc closing position of the previous weld. The steel plates and welds were not preheated before re-welding, resulting in the evaporation of water and the formation of cluster holes.