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Join Date: Jan 2005
Location: cooperstown NY
Posts: 894
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welding technique ?
i'm doing ok with my mig welds.
however, what's the cure for blow thru? should i increase or decrease wire speed? i already have power dialed all the way down. opinions? thanks
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bob 1972 E pos correction: expensive pos someday.... "shut up and drive!" |
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05-27-2008, 04:58 AM
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Location: MS.
Posts: 2,322
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Smaller wire might help. What size are you using now?
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84' Steelslantnose Cab. 1953 Dodge B-4-B-108" 90,127 miles 1953 Dodge B-4-C-116" 58,146 miles 1954 Dodge C-1-B8-108" 241V8 POLY 1973 Roadrunner 440-SIX-PACK* 1986 F-250 Super Cab-460 V8 tow Newest additions- Matching numbers 1973 340 Road Runner!! 1948 Dodge B-1-F-152" 1-1/2 ton Dump body, 39,690 miles others... |
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05-27-2008, 09:41 AM
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Location: cooperstown NY
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.025
i burn through after about 1/4 inch. could i be moving too slow? if i pause and restart, no problem, but it doesn't look too clean
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bob 1972 E pos correction: expensive pos someday.... "shut up and drive!" |
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05-27-2008, 01:14 PM
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Location: South Orange County
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How much of the wire is sticking out when you start. If it is too short it may cause burn through.
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1972 911T MFI 1995 911 C2 |
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05-27-2008, 03:27 PM
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usually start with 3/8" exposed and work about 1/4" from the surface.
i usually push the puddle.
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bob 1972 E pos correction: expensive pos someday.... "shut up and drive!" |
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05-27-2008, 03:48 PM
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Join Date: May 2002
Location: St Louis
Posts: 4,211
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Are you welding sheet metal? Have you seen the video on this page?
http://www.mig-welding.co.uk/thin-metal.htm
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Rick 88 Cab |
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05-27-2008, 10:02 PM
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Location: cooperstown NY
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great link, what a coincidence, that's what i'm already doing with my "pause and restart" technique.
i just didn't know it was kosher. its true the welds are a little over-penetrated. thanks to all for their input.
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bob 1972 E pos correction: expensive pos someday.... "shut up and drive!" |
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05-28-2008, 03:01 AM
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Slumlord
Join Date: May 2001
Location: Canada
Posts: 4,983
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Faster wire feed=more current=more penetration=more burn through
Less wire stick-out=more penetration=more burn through Slower travel=more penetration=more burn through Hotter gas (CO2)=more penetration=more burn through So use M5 gas, longer stick out, lower current and higher travel speed. You should also stitch weld, maybe 1/2-3/4" at a time to avoid burn through. |
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06-06-2008, 11:51 AM
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