| 摘要 |
1476593 Welding by fusion and pressure CATERPILLAR TRACTOR CO 26 Nov 1975 [9 April 1975] 48562/75 Heading B3R [Also in Division E1] A method of welding to a first plate member 20 having a curved surface portion 25 an edge portion 26 of a second plate member 22 comprises the following steps: welding, in a first welding stage, an elongate backing piece 27 to the surface portion 25 of the first member, perpendicular to its lines of maximum curvature, the backing piece 27, edge portion 26 and surface portion 25 defining a weld space 36, and arc welding, in a second welding stage the piece 27 and portions 26, 25 to form a weld 10. The backing piece 27 prevents metal blow-through and acts as a heat sink during the arc welding. The first welding stage may comprise a spot or arc welding process or, as shown in Fig. 5, continuously resistance welding a circular cross-section rod 27 to the surface portion 25 using a roller electrode 32 (Fig. 5) and, if desired, an opposing roller electrode 34 (Fig. 4, not shown). The method may be used in fabricating bulldozer blades (Fig. 1, not shown) in which the first member is convexly curved, e.g. cylindrical, at the surface portion 25. |
