Weld collapse
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The longitudinal seams of the pressure vessel shells welded by our company’s automatic welding machines always sag slightly, showing overall sagging. I want to analyze it to find the cause and resolve it. I hope those of you with welding experience can offer some guidance.
Is the welding travel speed too slow, and is the wire selected correctly?
There is suspicion of issues with the welding quality, including the materials used for welding, the welding current, and the way in which welding is carried out. It’s also possible that changes occur in aspects such as stress, plasticity, toughness, and strength after welding; higher plasticity and toughness along with lower strength and stress can lead to deformation at the welded area. High pressure or negative pressure inside the equipment can also cause deformation. Additionally, prolonged operation of the equipment may result in severe wear around it, which can also cause deformation – I have seen such cases