If the slag remaining after welding a pressure vessel is not removed before polishing, small pits will form on the inner surface – is it necessary to carry out additional welding?
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Netizens, what should be done in such a situation?
There are specified requirements for patch welding; follow those specifications
Reweld and run it again; it’s not necessarily due to polishing – it could be pits that formed during the rolling process
It could be welding slag, or it might be pits caused by debris and scale remaining on the rolling machine; you can tell by checking whether the small pits are arranged in a regular pattern
The cause should be identified first; the key is to put forward preventive measures...
It can be fixed; it was caused by polishing before the slag was completely removed
It depends on the size of the pit and whether the wood has been damaged; the standard specifications should be followed
Our company’s policy states that if the pits are deeper than 0.5 millimeters and have a depth of more than 0.5 millimeters, with no more than 10 such pits per square centimeter, TIG welding should be used; otherwise, the polishing accuracy cannot be guaranteed. Please refer to this guideline