Welding of dissimilar steels in pressure pipelines
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Is welding of dissimilar steels allowed in pressure pipelines? Seeking advice
Pressure pipelines do allow welding of dissimilar steels, but this requires very strict procedural specifications and high standards of quality control. Welding of dissimilar steels typically involves metal materials with different chemical compositions and mechanical properties; therefore, it is necessary to select the appropriate welding materials and methods to ensure that the properties of the weld zone meet the design requirements. In addition, strict post-weld heat treatment and quality inspection are also required to ensure welding quality and safety. It is recommended to consult professionals in detail or refer to relevant industry standards before performing such welding. .
In practical design, welding of dissimilar steels within the same category is generally allowed (such as 304 and 316), while welding of dissimilar steels from different categories is not permitted (such as Q235 and 304).