DESIGN DATA ON PRODUCTION METHODS 



257 



ARC WELDING THIN SHEETS 



Uniformly good arc welds in sheets less than 0.050 in. (18 gage) thick can be 

 made with generator-type welders with a minimum setting of 10 to 15 amp. with 

 stable operation at 20 amp. and higher. Stainless steel and Monel exhaust stacks 

 and manifolds for aircraft, which are of comparatively thin gage, are being fabricated 

 by this method. Results of tests on two aircraft materials, S.A.E. 1025 and 4130, 

 are shown in the following tables. 



RESULTS OF TESTS ON WELDED THIN TUBES 



* I, in weld; O, outside wehl. 



ROD SIZE AND AMPERAGE FOR WELDING 

 THIN-GAGE MATERIAL 



(Approximate) 



MINIMUM TENSILE STRENGTH OF WELDS FOR 

 WELDER QUALIFICATION TESTS 



(Air Corps Spec. 20013-B) 



Tubular Section Formed of Thin-gage Stainless Steel. 



A. Operations when plaster die formed parts are used: 





Round corners 



.jTx.. 



Could noj- be- 

 filled by arc 

 weld 



Removed ^^ _ 

 by nibbler^''' 



Worked info 

 circular cross 

 secHon 



Gas welded'' 

 B. Operations when steel or hard aluminum-bronze dies are used: 



Sharp corners y^=>. Arc welded^ x^?=5>v . , , , . yj:==^^^^^^^^^'^ 



' f^ ^ - '^ ^^ Slighr working /7^ ^. 



\^/' Cut off in press '-\---^ 



in fo shape - 



\^ 



By using metal dies, sharper corners can be formed and nibbhng oiDeration 

 eliminated. By shearing off excess material, section can be arc welded in less time. 



