1. adhesion and cold welding 
   附着和冷焊
2. gas shielded arc welding 
   气体保护电弧焊
3. shielded metal arc welding 
   手工电弧焊
4. welding stress and distortion 
   焊接应力和变形
5. health and safety in welding 
   焊接安全与卫生

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