Posted by admin on Monday, November 22, 2010 · Leave a Comment
Hi im having probs completing my test piece on mma ( arc stick ) welding. the weld is a butt weld on 8mm low carbon steel with 60 degree included angle, we have got to use a 2.4 low hydrogen rod for the root run (im using 55-60 amps) and 3.2 rutile rod for the cap (im being told to use 120 amps for this). anyway all im doing is blowing holes on the root run and the tutor will not advise can anybody help please??? im desperate
First off, MMA (manual metal arc) is more commonly known as SMAW ( shielded metal arc welding) or simply STICK as anyone who actually does it, calls it. Basically the hardest thing about being a great welder is knowing when to stop or keep going. Sometimes that puddle gets too hot and instead of fighting it, just pull out, grab and new rod or wire and fire back up. your root heat seems cold to me but I dont know what rod you are using. 1005 (55 amps) 1119 (60) 1211 or 1215 (65) 1513 or1527 (65-69) 6010-6018 (75-90) 7010-7018 (85-110) and so on so forth to the stainless and chrome metals. really you should try weaving a bit wider if you can not do it w/o running your rod straight up your weld line
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