Dissimilar-material joints
Dissimilar-material joints – interactive engineering module focused on dissimilar metal welding. Learning format: Decision guide · Active learning. Explains the principle, technical relationships and practical use.
Topic overview
A dissimilar joint is a material system in its own right. Weld metal is mixed from three sources, the two interfaces develop different microstructures, and differential expansion, diffusion and corrosion can dominate over static strength during service.
Has stability of the mixed zone and both interfaces been demonstrated for the full thermal, corrosive and mechanical life?
Weld chemistry is controlled by filler and dilution from both parent materials.
Each side may need different preheat, maximum interpass and thermal history.
What the module covers
- Dissimilar-material joints — dilution, interfaces and life
- 1. Mechanisms that must be assessed
- 2. Typical material combinations
- 3. Qualification sequence
- Design and fabrication checklist
- Practical rule
Related engineering terms
The module connects these terms with practical engineering explanations:
Continue with the practical module.
Open this topic directly in the interactive WeldScope portal.