View Full Version : Newbie Qustions
12-14-2007, 07:19 PM
I just puchased a new HH187. I have a couple of questions. I will be welding primarily 4130N and mild steel .065"-.025" wall. What would be the best .030 wire for this welder using a 25% 75% mix? Also what should my gas pressure be set at?
12-14-2007, 07:27 PM
don't know about the 4130N, but i can say i wouldn't weld with 030 wire on mild steel of those thicknesses. i would use 023, the 030 might burn through too easily. i would set the gas flow at 20 CFH. hope this helps.
12-14-2007, 10:08 PM
Wire is ER90S-B3, or ER70S-6 if tensil doesn't matter. John
12-14-2007, 10:15 PM
I welded 4130 high pressure pipe for down hole applications for the oil field industry with er70s wire. I was certified to 20,000psi and the process was certified for much more.
12-14-2007, 10:38 PM
As I said, if you dont worry about tensil strength, it is ok. John
12-15-2007, 07:00 AM
I'm just curious as to whether a decimal is in the wrong place in your thicknesses or not. .025, is the kind of tolerance you might find in my V-8 between moving parts. .25 = 1/4" .125 = 1/8" .0625 = 1/16" .0313 = 1/32" I'm not saying your wrong, but a verification of thickness might be good. For Chromoly, it'd be better to tig in the original posts thicknesses I would think.
Whatcha making with it? :) Sounds kinda like high grade bicycle tubing, or aircraft frame build up. Good luck! Brian Lee Sparkeee29
12-15-2007, 10:33 AM
yeah, you caught that huh, sorry. That should read .065 to .125 inch wall thickness. I am building circle track chassis. I thought 20 psi was right but the guage on my previous welder broke years ago and I just adjusted it by feel.