Welder Red Seal · Question
What does a rectangle symbol placed on the reference line of a welding symbol opposite the groove weld symbol indicate?
This is the symbol for using a backing bar. It indicates that a strip of metal is to be placed on the root side of the joint to support the molten weld pool. If
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Question: What does a rectangle symbol placed on the reference line of a welding symbol opposite the groove weld symbol indicate?
Answer options:
- A surfacing weld is required
- The joint requires grinding after welding ✅ A backing bar is to be used
- The weld should be inspected using radiography
Correct answer: A backing bar is to be used
Explanation: This is the symbol for using a backing bar. It indicates that a strip of metal is to be placed on the root side of the joint to support the molten weld pool. If the rectangle has an 'R' in it, it signifies the backing is to be removed after welding.
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