Impact of applying anti-corrosion paint on welding quality
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This post was last edited by Huajianren on 2011-4-4 19:26. At the construction site, I saw workers carrying out welding after rust removal and application of anti-corrosion paint; I wonder what effect the paint coating has on the quality of welding
Debris (rust, oil, paint, etc.) within 5 centimeters around the weld must be removed. It can be simply explained as follows: when painting is welded, high temperatures cause it to decompose, releasing elements such as H, O, and S that affect the quality of the weld
Reply to 2# 494067920: But it is stated that the epoxy primer applied can allow direct welding – does it depend on the specific type of paint?
Reply to 3# lwh70: Epoxy zinc-rich paint should also have an impact. For the several spherical tanks we worked on previously, the manufacturer applied a primer at the groove areas that was said to be suitable for welding, but it was still removed through grinding in the end.
Of course it needs to be polished. . . . . . . .
The high-temperature decomposition of paint releases elements such as H, O, and S, which can have a severe impact on weld formation, especially in cases where high standards are required for the welds. Contaminants and undissolved substances can be easily seen on the film, and needle-like pores may also form