Hi everybody. Just joined the Forum. Need some help in starting using an AC/DC rig 160 A I have bought about one month ago (Telwin -Italy)fully programmable (i.e. Amps, pulse, slope, HF etc) with 15 programs included and 15 empty locations for self programs. I am pretty proficient in Oxyacetylene, brazing and stick welding (have another small inverter also equipped with TIG-but only DC-torch) and have so far obtained acceptable results in TIG welding mild steel. Cannot weld Aluminium though( my aim would be to join together 1/16" sheets, when making small boxes and containers, rather than have to rivet them).
I have so far been setting the machine according to recommended program(s) but I keep melting the darned metal on the two sides of the joint, rather than getting a proper pool (with or without a stick). Have brushed and cleaned with acetone everything. Obviously the machine is not(yet) properly adjusted for the job. So far I have tried the recommended manufacturer's programs, lowered the amps, switched from balanced to unbalanced pulse but at no avail. Could anybody suggest a starting pattern, from which I could proceed? I have read several books (the Miller GTAW brochure among them) and followed their advises, but I am afraid I have not yet found a correct method from where to start experimenting, before proceeding to real jobs.
Thanks a lot for any help.