What causes the weld metal inside the pipe to disappear?

2020-09-02View Original

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In pipes containing a certain amount of acid, after operating for some time, it was found that the weld metal inside the elbow welds had completely disappeared, as shown in the image. Please help analyze the reason for this.

Reply #22020-09-02

The material is 316L; the composition of both the base material and the remaining weld metal has been analyzed, and there are no issues.

Reply #32020-09-02

Generally, TIG welding is used for the root pass, right? Is all of this done with TIG welding? Judging from your pictures, it seems not to be the case; it’s likely that the peeling is caused by a different type of welding material or an inappropriate selection of materials.

Reply #42020-09-03

The substrate has not corroded, and the weld metal should not corrode either

Reply #52020-09-04

Has anyone experienced this problem?

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What causes the weld metal inside the pipe to disappear?

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