| 摘要 |
Protective gas welding uses an electric arc formed between electrode and workpiece. A constant voltage is applied to form an electric arc. The electrode is inserted through a contact tube into the electric arc and a required distance between contact tube and workpiece is maintained. The novelty is that a smaller contact tube space (compared to the usual distance on welding with a rotating electric arc) of around 10-30%, and a lower voltage (compared to the usual voltage on welding with a rotating electric arc) of around 20-40% are used. The rotation electric arc produced is screened with a protective gas contg. 1-5 (vol.%) O2, 14-34 He and 65-85 Ar or 1-5 O2, 14-34 CO2 and 65-85 Ar. |
