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Designing a Welding Jig

A welding jig holds parts in position while they are welded. Its job is to control heat distortion and keep assemblies consistent.

June 7, 2026 5 min read
Designing a Welding Jig

A welding jig holds parts in the right position while they are welded. Its job is to control heat distortion and keep assemblies consistent from part to part.

What a good welding jig does

  • Locates parts on a datum, not on a random face
  • Allows access for the weld torch
  • Releases easily after weld shrinkage
  • Is itself rigid enough not to warp

A jig that is too tight locks in stress and springs when released; too loose and the parts shift. The right clearance is designed, not guessed.

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