| 摘要 |
1,219,442. Welding by fusion. CONTINENTAL SCHWEISSAPPARATE A.G. 5 Feb., 1968 [6 June, 1967], No. 5617/68. Heading B3R. [Also in Division F4] A flame welding torch for use in build-up welding comprises a handle part 1, a part 2 for feeding powder, e.g. a fine metal powder, and a set of interchangeable burners 3 each of different welding efficiency, each burner including its own double injector adapted to the efficiency of its associated burner, the arrangement being such that, in the assembled state of the torch, the injector projects into a recess of the part for feeding the powder, the recess being connected. to channels for the feed of two gates and a powder and the part for feeding the powder being releasably connected (during build-up welding) to the handle part. The dimensions of and method of attachment of the part 2 for feeding powder to the handle part are the same as the dimensions of and method of attachment of the burners 3 to the part 2 so that the burners 3 may be directly attached to the handle, the powder feed part being omitted, when flame welding without build-up is to be performed. The rate of powder feed is controllable by a lever 13 and the rates of feed of two gases forming a combustible mixture, e.g. oxygen and acetylene, are controlled by taps 8, 9 on the handle part. Each double injector comprises three parts (58, 65, 71) (Fig. 2, not shown) screwed together to define a conical annular chamber (73) in which the gases mix and a further such chamber (67) in which the powder is mixed with the gaseous mixture. |
