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What effect does preheating, concurrent heating, or post heating have on a welding a joint?
A) Decreasing the temperature gradient in the weld area and relieving internal stresses.
B) Increasing the temperature gradient in the weld area and relieving internal stresses.
C) Decreasing the temperature gradient in the weld area and intensifying internal stresses.
D) Increasing the temperature gradient in the weld area and intensifying internal stresses.
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