Connection method between pipes and tube sheets
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When purchasing air coolers, the suppliers offer various methods for connecting the tubes and tube sheets, including expansion joining, welding, and a combination of welding and expansion joining. I’m not sure which one is better; could anyone with experience give me some advice? :handshake
Various welding methods have their own applicable conditions; see 151 for details.
Generally, thin tubes are expanded, while thick tubes are welded, depending on the specific operating temperature at the tube ends.
Each has its advantages; the choice depends on the pipe type, material, and operating conditions.
I think it is related to the wall thickness and the specific operating temperature under which it is used
Of course, it's better to use both welding and expansion joining.
Generally, welding is done first and then expansion follows.
Yet even with such regulations, the air coolers still leaked upon arrival at the site, resulting in a high rate of rework.