| 摘要 |
In order to ensure the necessary gas coverage when welding stainless steel such as pipes (1, 2) without the consumption of gas becoming unacceptably high, and while at the same time reducing the cooling time and therewith the working time as much as possible, according to the invention there is used a method and apparatus which comprises a rear gas apparatus (5) provided with copper jaws (15) which are provided with outlet openings (36) for the gas and coolant pipes (38, 39) which cool the welding zone and the gas. In a corresponding manner, the welding apparatus (4) can be provided with gas coverage in the form of a casing (7) which is supplied with gas (11), and which is also provided with a coolant pipe (10) for the cooling of the welding zone and the gas. In this manner, it is possible to ensure that the purging gas does not contain more than approx. 25 p.p.m.O2, and that the temperature of the welding zone is reduced to below approx. 250 DEG C and is thus below that limit at which damage as a result of corrosion can occur. |
