| 摘要 |
Arrangement for improving quality in fusion welding operations where protective gas is supplied to the welding point via a hose line. The arrangement comprises means (5, 6), such as a bypass line connected parallel to the solenoid valve (4) which is usually connected into the protective-gas hose (3), in order to make a small flush-gas flow pass through the protective-gas hose (3) or a considerable part of its length, when the normal protective-gas flow is shut off. In this way, the quantity of impurities brought along by the protective-gas flow from the inside of the protective-gas hose (3) and supplied to the pool is reduced.
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