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A common method to control distortion during welding is to use strongbacks. What is a strongback?

Strongbacks are pieces of steel (such as flat bar or angle iron) temporarily tacked across the weld joint on the opposite side. They provide rigid restraint to

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Question: A common method to control distortion during welding is to use strongbacks. What is a strongback?

Answer options:

  • A series of staggered intermittent welds on the opposite side of the joint. ✅ A heavy-duty brace or stiffener tacked to the workpiece to maintain alignment.
  • A copper or ceramic strip placed on the root side of a joint.
  • A pre-bending of the plates in the opposite direction of expected distortion.

Correct answer: A heavy-duty brace or stiffener tacked to the workpiece to maintain alignment.

Explanation: Strongbacks are pieces of steel (such as flat bar or angle iron) temporarily tacked across the weld joint on the opposite side. They provide rigid restraint to resist the shrinkage forces during welding and cooling, thereby minimizing angular distortion and maintaining alignment.

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