Method and arrangement for improving quality in fusion welding operations
AssigneeAGA Aktiebolag
InventorFred Galesloot
Life of this patent
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Abstract
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 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.
Claims28
Method of improving quality in fusion welding operations where protective gas is supplied to the welding point via a protective-gas hose line, comprising the step of continuously passing a small flush-gas flow through the protective-gas hose or a considerable part of its length when a normal protective-gas flow through the protective-gas hose is shut off, whereby the quantity of impurities brought along by the protective-gas flow from the inside of the protective-gas hose and supplied to the welding point is reduced.
Arrangement for improving quality in fusion welding operations where protective gas is supplied to the welding point via a hose line, characterized by means for causing a small flush-gas flow to pass through the protective-gas hose (3) or a considerable part of its length, when the normal protective-gas flow is shut off when a valve is shut, in order to reduce the quantity of impurities brought along by the protective-gas hose (3) and supplied to the pool, said means for causing a small flush-gas flow comprising a passage in said valve for flush-gas flow which flows even when the main passage of the valve is shut.
Dependencies are inferred from the claim text.