Welder Red Seal · Question
You are assigned to build a bridge component from a blueprint. A dimension is shown as 1500 ± 2 mm. What does the '± 2 mm' signify?
The '± 2 mm' in '1500 ± 2 mm' specifies the tolerance, which is the permissible variation from the nominal dimension. This means the actual length can be anywhe
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Question: You are assigned to build a bridge component from a blueprint. A dimension is shown as 1500 ± 2 mm. What does the '± 2 mm' signify?
Answer options:
- The minimum allowable length is 1498 mm.
- The maximum allowable length is 1502 mm. ✅ The acceptable range of deviation from the nominal size.
- The material shrinkage allowance when welding.
Correct answer: The acceptable range of deviation from the nominal size.
Explanation: The '± 2 mm' in '1500 ± 2 mm' specifies the tolerance, which is the permissible variation from the nominal dimension. This means the actual length can be anywhere between 1498 mm (1500-2) and 1502 mm (1500+2) and still be considered acceptable. This is critical for fit-up and functionality.
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Question explanations
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- A welder is preparing to weld 20 mm (0.8 in) thick high-strength low-alloy (HSLA) steel using FCAW-G. The weld
- A structural steel fabricator is using FCAW-S (E71T-8 wire) to weld heavy sections of structural steel in an o
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