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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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