A study was made of the welding procedure for X70-L245 butt joint of pipeline steel.
针对不同强度级别的管线钢x 70和L245对接的焊接工艺进行了研究。
Design standard of automobile body welding procedure affects the product quality and the cost greatly.
轿车四大工艺之一的车身焊接工艺，其设计水平对产品质量和成本有较大影响。
Design standard of automobile body welding procedure affects the product quality and the cost greatly.
轿车四大工艺之一的车身焊接工艺，其设计水平对产品质量和成本有较大影响。
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