The existence of grey spot may cause brittle crack of the joint, therefore, controlling grey spot occupy a decisive position to ensure the quality of rail resistance welding.
灰斑的存在易导致接头的脆性断裂。因此，控制灰斑对保证钢轨接触焊质量举足轻重。
The existence of grey spot may cause brittle crack of the joint, therefore, controlling grey spot occupy a decisive position to ensure the quality of rail resistance welding.
灰斑的存在易导致接头的脆性断裂。因此，控制灰斑对保证钢轨接触焊质量举足轻重。
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