need some welding help/advise |
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need some welding help/advise |
Jeroen |
Nov 21 2005, 07:24 PM
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#1
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914 Guru Group: Members Posts: 7,887 Joined: 24-December 02 From: The Netherlands Member No.: 3 Region Association: Europe |
ok... having some trouble making nice welds
well, partially below is a pic of a recent weld usually, I can get a nice weld going. good penetration etc. and then out of the blue, it'll start sputtering and globs of weld start to stack making thick ugly welds what's my problem? - hand/eye coordination - wire speed - amp setting any tips/pointers? please help me out... I hate the look of ugly welds and it's a huge PITA to grind 'm out and start over Attached image(s) |
Bleyseng |
Nov 21 2005, 07:27 PM
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#2
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Aircooled Baby! Group: Members Posts: 13,035 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
You are using a shielding gas set up??
Clean the sufaces better... Maybe a tad more amps tot ziens |
ChrisFoley |
Nov 21 2005, 07:33 PM
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#3
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I am Tangerine Racing Group: Members Posts: 7,934 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
Could it be impurities on the surface, and not so much your welding technique?
If this happens and you are concerned with the appearance and/or ultimate strength I would recommend having a die grinder handy with a carbide burr to grind out the offending section and reweld. Going over the top just leaves the impurities inside, often in the form of a big gas pocket. |
McMark |
Nov 21 2005, 07:38 PM
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#4
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
You're using a MIG, right? I know that when I swapped out my lining there was a marked improvement. Big lesson for me. Also related, I've had people wrap my line really tightly which isn't good for the lining either. Maybe new gun pieces are in order as well.
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scotty b |
Nov 21 2005, 07:45 PM
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#5
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rust free you say ? Group: Members Posts: 16,375 Joined: 7-January 05 From: richmond, Va. Member No.: 3,419 Region Association: None |
Amperage looks O.K. from pic, clean clean clean. Dirty metal, rusty metal does not weld well at all. (unless stick welding) clean BOTH sides of the metal if at all possible. Depending on the welder, some of the cheaper machines have a coller that simply slides on (as opposed to threading on) and what happens quite often is that as you weld, the collar tends to slip further down the torch head causing the shielding gas to disperse before reaching the weld. Also make certain there is no breeze to blow the gas away, it doesn't take much. 15 C.F.M. is plenty of flow for welding.
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bondo |
Nov 21 2005, 07:46 PM
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#6
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Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
Is that weld thru primer or regular paint? If it's paint, get it outta there! Get it ground to good clean steel a couple centimeters from the area to be welded, and your results will be better. Even if it is weld thru primer, it still helps to get it off, when you can.
Aside from that, adding heat or reducing wire speed will lessen that, but of course you can go too far the other way. I like to adjust my welder to the point that if I stop in one spot it'll burn a hole. That way when I'm welding I'm always at the verge of burning through, but I get good penetration. Also, the extra heat seems to help burn off impurities ahead of the weld. |
Trekkor |
Nov 21 2005, 07:47 PM
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#7
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I do things... Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California |
Looks like you're out of gas.
KT |
Jeroen |
Nov 21 2005, 07:53 PM
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#8
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914 Guru Group: Members Posts: 7,887 Joined: 24-December 02 From: The Netherlands Member No.: 3 Region Association: Europe |
surfaces are clean
no rust or paint (except a thin coat of weld through primer) Mark, what do you mean with "lining" the wire? oh and yes, this is a MIG with gas |
TimT |
Nov 21 2005, 07:55 PM
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#9
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retired Group: Members Posts: 4,033 Joined: 18-February 03 From: Wantagh, NY Member No.: 313 |
You need to clean to a nice shiney substrate before you weld. But you knew this already!! is this a trick question?
was your tub dipped? |
scotty b |
Nov 21 2005, 08:00 PM
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#10
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rust free you say ? Group: Members Posts: 16,375 Joined: 7-January 05 From: richmond, Va. Member No.: 3,419 Region Association: None |
Liner runs through the sleeve, and the wire runs throught the liner. Liners must be appropriate size for the chosen wire, or the wire can get kinked inside the liner. Liners can also get a kink in them if they are ever crushed or folded too tightly. Also check the tension on your drive rollers inside the machine. Prolly not the problem but check it anyway. Best way to check is to run your wire into a piece of wood, the roller should be tight enough to feed the wire but loose enough to free spool when the wire hits the board, this is to prevent the wire from "birdnesting' should you ever lose your arc. Yes it happens!
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Trekkor |
Nov 21 2005, 08:05 PM
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#11
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I do things... Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California |
Get some scrap of the same guage.
Turn up the voltage and turn down the wire speed. Practice with that "new" setting and see if your results improve. (IMG:http://www.914world.com/bbs2/html/emoticons/welder.gif) KT |
McMark |
Nov 21 2005, 08:07 PM
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#12
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
The liner is what keeps the MIG wire from jamming as it goes down the hose. As they get older or bent the wire doesn't feed out as smoothly. It doesn't look like you're out of gas or having gas problems. When I forget to turn my gas on the welds are a big splattery, cratery mess. Those are relatively clean welds.
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MecGen |
Nov 21 2005, 09:06 PM
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#13
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8 Easy Steps Group: Members Posts: 848 Joined: 8-January 05 From: Laval, Canada Member No.: 3,421 |
Dude wazzup
120 volt machine, wire size?... (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif) Try reducing wire feed speed, less gas, hold your tip closer. I don't trust the regulators and go more by ear. Drag a file on your groung clamp. Both theses things add to a declining quality of weld over a piriod of time. Later (IMG:http://www.914world.com/bbs2/html/emoticons/beer.gif) |
sean_v8_914 |
Nov 22 2005, 01:23 AM
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#14
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
I see evidence of off-gassing. (the white haze) you are cooking some filth into your weld. after cleaning the metal, give it a light pass with a torch just before welding it up. this will draw the moisture out and if it is chemically contaminated, you will see it discolor or smoke. this woudl be an indication of additional cleaning required
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fiid |
Nov 22 2005, 04:08 AM
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#15
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Turbo Megasquirted Subaru Member Group: Members Posts: 2,827 Joined: 7-April 03 From: San Francisco, CA Member No.: 530 Region Association: Northern California |
Ja-roon is in Holland I think... They don't have pansy 120volt electric there - everything is 220/240V. |
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Jeroen |
Nov 22 2005, 06:46 AM
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#16
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914 Guru Group: Members Posts: 7,887 Joined: 24-December 02 From: The Netherlands Member No.: 3 Region Association: Europe |
yep, we got 220V standard and 380V as power (comparable to your 110 and 220) wire is 0.6mm talked to the guy from the bodyshop today and he's gonna get me a different type of wire that should work better with older metals thanks for all the input and I'll keep ya posted |
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sgomes |
Nov 22 2005, 08:15 AM
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#17
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Electric Member Group: Members Posts: 815 Joined: 6-May 04 From: Campbell, CA Member No.: 2,029 |
All I can add to this is your bad welds look ten times better than my best welds! (IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif)
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fiid |
Nov 22 2005, 11:18 AM
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#18
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Turbo Megasquirted Subaru Member Group: Members Posts: 2,827 Joined: 7-April 03 From: San Francisco, CA Member No.: 530 Region Association: Northern California |
(IMG:http://www.914world.com/bbs2/html/emoticons/agree.gif) It looks like when you get around this issue you are going to have some really nice looking welds. They look a lot better than some of my welds.
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