| 摘要 |
1,210,695. Welding by fusion. LA SOUDURE ELECTRIQUE AUTOGENE PROCEDES ARCOS S.A. 21 Feb., 1968 [21 Feb., 1967], No. 8441/68. Heading B3R. A segmented weld-backing bar for supporting weld metal and slag in joining metallic plates by fusion welding e.g. electroslag or electrogas welding, comprises a row of metal segments connected together by a support each segment being movable relative to an adjacent segment and the segments being of metal of higher thermal expansion than the metal of the support. In one embodiment (Fig. 1,) abutting segments 25 are individually attached to the links 30, 31 of a roller chain 26 the longitudinal dimension of the segments being less than or equal to the chain pitch. Each segment may have a recess (37) (Fig. 2, not shown) in its weld-engaging surface for weld shaping. In another embodiment (Figs. 3, 4, 5, not shown) each segment (25<SP>1</SP>) is connected to its neighbours by means of inserts (41) of shape less than 180 degrees cross-section of a tube, the inserts being located in aligned arcuate grooves (38) in each segment and being connected to a link (42). The segments may be trapezoidal in longitudinal section such that the bar is capable of conforming to a convex (Fig. 6, not shown) or concave (Fig. 7, not shown) work surface. In a further embodiment (Fig. 14), the segments are provided with work-engaging projections 62 for use in welding X-preparation joints. In yet another embodiment (Figs. 15, 16, 17, not shown), the support for the segments comprises two longitudinally-extending hard steel cables (63, 64). The segments may be of copper or copper alloy e.g. berylliumcopper and the chain links may be of steel. |
