The connection between the heat exchanger tube head and the tube plate adopts welding+welding+expansion.
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The connection between the heat exchanger tube head and the tube plate is welding + welding + expansion. What does welding + welding mean? Which expert can give the answer?
Does it mean that the heat exchange tube head and the tube plate are welded twice? It is rarely written like this.
Is it possible to use argon arc welding without using welding wire for the first time, and use welding wire for the second time, plus expansion joint?
According to GB151, there are only strength welding + expansion and strength expansion + sealing welding, so I think the welding + welding here should refer to the specific operation method of welding.
"The expression "welding + welding + expansion" has never been seen before. The common ones are: strength welding + sticking expansion or strength welding + strength expansion and strength expansion + sealing welding.
I suspect that the draftsman accidentally changed welding+expansion into welding+welding+expansion. Maybe he had other intentions. I look forward to the emergence of experts.
Generally, heat exchangers use welding + expansion. I really haven’t heard what you said. It’s probably because the drawing was wrong.