| 摘要 |
946,046. Welding by fusion; making tanks. TRAILMOBILE Inc. Oct. 13, 1960 [April 28, 1960], No. 35128/60. Headings B3A and B3R. [Also in Divisions B7 and E1] A method of making a stationary tank or the tank of a tanker vehicle (see also Divisions B7 and E1) comprises positioning already fabricated end walls 12, 11, Figs. 5, 6, in spaced relation to ribbed and braced pre-stressed bulkheads 41 and baffle plates 93, and welding to them by automatic linear seam welders, upper and lower stiffeners or booms 6, 7, and outer shell plates 8, the welds between the plates 8 preferably being registered with the bulkheads and baffles. The booms 6, 7, Fig. 9, may be made from two extruded longitudinal metal sections 47 and two sections 46, welded together along seams 48 which may butt, rabbet, or overlap. In a modification, however, the lower boom may comprise a one-piece central section. Horizontal forward braces 102 are welded into grooves 103 in the lower boom to give longitudinal strength, and similar braces 107 are provided at the rear of the tank. In another embodiment the lower boom sections 46, 47 are gripped by their external ribs 56 by a clamp 116 and welded by an electrode 117 to form one half of the boom. The boom half thus produced and one outer section of the top boom are held together with a complete half shell plate 120 by clamps 118, Figs. 12, 13, and seam welds are made at 63, 64. Two such assemblies are then clamped together as in Fig. 15 and wrapped around the bulkheads 41 and baffles 93 as in Fig. 14; the central section 65 being clamped and welded to the assemblies as shown in Fig. 17. The jig of Fig. 15 may be used to build up a boom of any width from any number of narrow sections by forming the ribs 56 of dovetail shape so that the sections may be held by a bar 126 and a clamp 124 which may be curved to the curvature the boom is to have. In a modification the booms also form the shell of the tank and are welded together. Specification 821,306 is referred to.
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