Composite pipe 15CrMo+0Cr13 (8+3) welding process
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Recently, I encountered a composite pipe 15CrMo+0Cr13 (8+3) in the project. Since the welding unit did not have a suitable welding evaluation, they planned to use R307+A302 for welding. They said it was checked according to the specifications. Is this okay? Is this kind of composite pipe rare? I plan to contact the designer and directly change it to 304 material. Is it possible? Please tell me!
If you use R307+A302, there will be no problem for the base layer and cladding layer. A309 dissimilar steel electrodes should be used for the intermediate transition layer. OCr13 and TP304 are different, you have to consider the different materials.
That means the transition layer in the middle needs to be welded with dissimilar steel electrodes, right? Thanks