Abstract: A torch angle measuring device, comprising: (a) a support rigidly clampable to the nozzle of the torch; (b) a reference member; (c) joint means between the reference member and the support providing axes of rotational movement therebetween, the axes being at 90.degree. to each other and each being transverse by 90.degree. to the nozzle axis; and (d) plumb level means on the reference member for displaying levelness in planes parallel to the joint means axes. The joint means has the first of the axes effective to determine lead angle and the second of said axes effective to determine transverse angle. The device additionally includes means for holding the device in an adjusted angle position.

Abstract: Method of welding aligned aluminum torque tube components, comprising (i) defining a stepped square-butt joint to be welded by preforming the ends of said torque tubes and assembling such ends together in the nested condition; (ii) establishing an electrical direct current arc between a positive consumable aluminum-based electrode and said joint as cathode, the arc being shrouded in a shielding gas consisting, by volume, of 2-5% oxygen and the remainder inert gas, the current to the arc being pulsed at a frequency of 40-60 cycles per second while maintaining an average current of at least 200 amps; and (iii) while holding the pulsed arc in a predetermined orientation (i.e., position angle 45.degree.-60.degree., lead angle 5.degree.-15.degree., transverse angle 12.degree.) to the joint, moving the arc along the joint in a single pass at a relative speed of at least 60 inches per minute.