| 摘要 |
Butt-welding the edges of sheet materials 0.4 - 3 mm thick and made mainly from steel with a proportion of 0.015 per cent by weight of aluminum with the aid of at least one laser beam involves using a gas mixture comprising 30 - 80 per cent, preferably 40 - 70 per cent, nitrogen and the remainder helium to assist the laser beam. The procedure employs a CO2 laser with a power of 4 - 10 kW, preferably 6 - 8 kW, or a YAG laser with a power of 1 - 6 kW, to weld the edges of sheet materials with an anti-corrosion surface coating, e.g. of zinc. The sheet materials, e.g. of steel with an elasticity limit of at least 3000 MPa, can be subjected to at least one stamping procedure after welding. |
