. Engineering and Contracting . rtions buttV elds are required. No scarfing or bevelling is resorted toand no pains are taken specially to clean the parts whichare to be welded. When all the necessary Joints on oneface of a truss are welded the truss itself is turned over sothat velding may be continued on the joints on its otherface. For the latter operation a jig is not required, since thewelds m\ the other face keep the various parts accuratelyin position. When completed each joist weighs about 33fi were informed that one welder and one laborer, havingthe materials cul to length, can
. Engineering and Contracting . rtions buttV elds are required. No scarfing or bevelling is resorted toand no pains are taken specially to clean the parts whichare to be welded. When all the necessary Joints on oneface of a truss are welded the truss itself is turned over sothat velding may be continued on the joints on its otherface. For the latter operation a jig is not required, since thewelds m\ the other face keep the various parts accuratelyin position. When completed each joist weighs about 33fi were informed that one welder and one laborer, havingthe materials cul to length, can assemble and weld completecne truss in an average total time of 1% hours, and attainan average output of over five complete trusses in one 8-hourday. As a matter of fact, on more than one occasion theyhave hoen timed to produce a completely welded truss in .50minutes. The work of fitting and welding the cap and base-plate to a stanchion can be done in average working in %hour. The operation has actually been done in % hour. The. Fig. 1—Arc-Welded Truss for Saw-Tooth Roof Fig. 2—Arc-Welded Truss for Stable Roof. ft., is arranged with only one floor and has brick walls. It welding of the trusses when hoisted into position is also ex-will be covered in with a saw-toothed roof so as to obtain a peditiousiy performed. north light illumination. In all there will be 93 trusses, as il- The current employed is, as we have said above, alternat- lustrated in Fig. 1. Vertical H-shaped steel stanchions ai-e Ing. It comes on to the site at 6,000 volts and is first stepped arranged in lines at about 22 ft. centers and they carry 5 in. down to 200 and then again to 70 for the welding circuit, in by 12-in. steel joists. Some of the trusses are fixed imme- which a reactance coil is inserted. The electrodes employed diately over the stanchions, while the others are carried by are of mild steel, flux coated. the joists, being fixed to the lower flanges of the latter mid- On the same site are b
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