针对奥氏体不锈钢材料，系统地开展了YAG- MAG 激光电弧复合焊工艺研究。
The process investigation on hybrid YAG - MAG laser arc welding of austenite stainless steel is systematically developed.
该结构是由混凝土和钢材制成，外层用复合木板包覆，保证其耐久性。
The structure is made of concrete and steel, while the outside layer is clad with composite wood panels that offer guaranteed durability.
把更换下来的旧油管加工成复合油管应用到杆管偏磨的油井中，既延长了检泵周期，又节约了生产新油管的钢材。
Re-machining the failed tubing into complex tubing and re-usage of it, can prolong pump-checking cycle and save steel.
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