Lincoln SP135 PLUS

[JustLooking]

How accurate is this Lincoln Advertising for the SP135 PLUS VS MM135 for the pictured examples of the actual welds? Is it the person doing the welding or is it the MIG Machine itself?

Looking at it for sheetmetal mig welding only.

http://content.lincolnelectric.com/pdfs/products/literature/av564.pdf

Why does the Lincoln SP135 Plus Instructions recommend reversing the polarity to DC(-) when MIG welding 24ga metal VS regular Mig welding setup for polarity DC(+)? This is in the foot notes on the door chart for a recomendation.

Would this recommendation have worked in the pictured example, link above, to make a better weld with the MM135 on the 24ga welds?

[JustLooking]

Would reversing the polarity to DC(-) for the 24 ga welds improve the MM135 results? Or is the Lincoln 135 Plus just this much better at these small gage sheetmetal welds? The pictures seem to show it is.

"Shown: 24 ga. material welded with .025 solid wire and 75/25 mixed gas."

24ga weld picture MM135 from pdf link:
http://home.comcast.net/~dcofer4/pics1/135MM24ga.jpg

24ga weld picture Lincoln 135 Plus from pdf link:

http://home.comcast.net/~dcofer4/pics1/135Plus24ga.jpg

[Carl T.]

DC(-) makes a much colder weld. I am surprized that your machine says that on the door. I have the WeldPak 3200 (same as the SP 135 and it does not say to do this on mine. Do they tell you to turn up the voltage a little as compared to what they recommend for 22 gauge at DC(+)?
The weld for the lincoln machine on 24 gauge looks believable. I think that some practice, the miller should make a better weld than what I see there.

[Jpt921]

Miller has a much hotter weld for the correct setting.

[Pentawelder]

From what I understand you only need to switch polarity for FCAW welding (Lincoln calls it innershield). 2/3 rds of the heat goes to the work and 1/3rd to the wire. Reason being that there's much less metal in FCAW wire just lots of flux and will burn back fast.

[ShieldArc]

As of today, the sp135plus is the best 120V welder out there...

[Guttafixit1]

Hi I'm new to this site. Been reading alot of stuff about mig welders and the 240V sounds the best but I can't get 240V right now. So I have to stick with 120V. I've been looking at the SP-135 PLUS. I can buy 1 for 536.00. This is at an welding store. Would like to find a used one. I'm new at welding. Watched friend of mine weld with his SP 155 (I know it's 240V) and he said he would help me out when I get one. I was wondering if ShieldArc is correct about the SP 135 PLUS is the BEST out there for 120V.?? Any help would be appreciated. Will be for hobby use. Thanks

[Sandy]

How accurate is this Lincoln Advertising for the SP135 PLUS VS MM135 for the pictured examples of the actual welds? Is it the person doing the welding or is it the MIG Machine itself?

:laugh: :laugh: How accurate do you think those depictions are?? I'd bet those are two very carefully chosen examples. No doubt their factual information as to the voltage levels at lower settings is true, but I'd more or less ignore the pics.

Why does the Lincoln SP135 Plus Instructions recommend reversing the polarity to DC(-) when MIG welding 24ga metal VS regular Mig welding setup for polarity DC(+)? This is in the foot notes on the door chart for a recomendation.

With stick, and the more common rods, Straight Polarity/DCSP/DCEN normally acheives less penetration which is better for thinner materials or fill only apllications. Reverse Polarity/DCRP/DCEP normally acheives deeper penetration.

I suppose the same might be true with GMAW altho I'd think the wire (stick also) make-up would play a large role in that. If a wire type says it will run best on DCEP then that's what it is designed for, primarily. Changing the polarity on some wires may produce very nice results with less penetration but yet again just might produce crap with others. Experimentaion could prove that out wire by wire if the manufacturers specs don't make any statements to the effects. I doubt that it's a blanket statement that could be made to fit any and all solid wires.