Abstract: A technique for resistance welding an attachment such as a collar or base ring to a tank head section by causing welding current to flow through weld protrusions disposed on the attachment and which are pressed against the tank section. Electrodes are contacted to the attachment and the tank section in such a manner to provide for substantially equal welding current paths through the protrusions.

Abstract: An improved aluminum propane gas cylinder with a braced liquid line or pipe. The brace is welded to a joggle formed in the rim of the cylinder top head section, and includes a pair of tines which are crimped around the liquid pipe to secure it against vibration. Securing the brace to the top head joggle permits assembly of the liquid pipe to the brace before joining the top and bottom head sections, and complies with regulations against welding to the straight surface of the cylinder. With the liquid line brace in this manner, the susceptability of the liquid line to fatigue cracking is substantially reduced.