Problem of too short distance between circumferential welds of pipes
Thread Content
During construction, when the spacing between the circumferential welds of the pipes is less than 100 MM, can post-weld heat treatment be used to eliminate welding stresses?
It’s generally not needed. This distance is no problem. .
Too small weld sizes mainly lead to the overlap of the weld heat-affected zone, thereby altering the thermal condition and mechanical properties, among other things. Internal stress also exists at the same time. If the pipe wall is thick, post-weld heat treatment can be considered.
Generally, the distance between two welds should be no less than the diameter of the pipe; if this requirement is not met, the section in question must be cut out and rewelded, otherwise it will lead to serious problems later on. If it cannot be separated after operation, then treating this section as a weak point and strengthening it is also an option.