full penetration or?

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If my butt welds are not reaching full penetration can i weld the other side and have the same strength?
Reply:Do a bevel on both sides with a 1/16 land, and you'll have a good weld.Penetration is not with the rod, it tis with ye olde grinder.  (Olde English Nite"Any day above ground is a good day"http://www.farmersamm.com/
Reply:Welding is all about grinding.  Sorry dude, it be what it beA solid mechanically sound joint is beveled.  Period.If you'r e making something, you will spend 90% of your time cutting, fitting, and beveling.  That's good welding!!!!!!!!!!!!"Any day above ground is a good day"http://www.farmersamm.com/
Reply:ahhh thanks for the info. now might be stupid question but should i put the metal as close as i can or leave a slight space?
Reply:A square (non-beveled) groove is an acceptable type of butt weld joint on thinner material.  Beveling and gapping are standard practice on thicker material.MM350P/Python/Q300MM175/Q300DialarcHFHTP MIG200PowCon300SMHypertherm380ThermalArc185Purox oaF350CrewCab4x4LoadNGo utilitybedBobcat250XMT304/Optima/SpoolmaticSuitcase12RC/Q300Suitcase8RC/Q400Passport/Q300Smith op
Reply:Originally Posted by DesertRider33A square (non-beveled) groove is an acceptable type of butt weld joint on thinner material.  Beveling and gapping are standard practice on thicker material.
Reply:yea im working with 1/4 steel using a mig welder for my practice. should that thickness have an angled bevel? and what kind of gap?
Reply:I'd bevel it at a 45 or 60 with a little bit of unground material to hold the dimensions, again maybe 1/16 inch.If you can get to both sides, bevel both sides.You'll see with practice how much heat is actually getting into the joint.  If it's blue on the backside, it's probably ok."Any day above ground is a good day"http://www.farmersamm.com/
Reply:Here's a decent pic of a good heat signature on the backside of a weld(stick weld)With MIG, I'm not sure you'll get such a pronounced signature, but it should be blued from the heat  Look for discoloration Attached Images"Any day above ground is a good day"http://www.farmersamm.com/
Reply:yes you can weld both sides. weld one side of it then flip it over and dig down to good metal again with your grinder then weld away. Its standard practice on heavy equipment.
Reply:thanks for the great info will keep practicing and tweeking
Reply:Originally Posted by farmersammDo a bevel on both sides with a 1/16 land, and you'll have a good weld.
Reply:depending on the joint design you may not need full penetration also known as complete joint penetration (CJP) but when i give weld test on 3/8" with 37.5 degree bevel to asme ix testing i allow the welder to use a back pass after back grinding to soild metal. there are 3 types of welds , fillet welds, partial joint penetration groove welds (PJP) and the CJP groove weldsAs far as root gap and face that up to you and what you can handle (home shop)  or the weld engineerNo job is done until the paperwork is done.
Reply:Originally Posted by harvdog31If my butt welds are not reaching full penetration can i weld the other side and have the same strength?
Reply:Originally Posted by Broccoli1http://content.lincolnelectric.com/p...ature/e727.pdf "MIG weld 24 gauge up to 3/16” sheet metal in a single pass.  Weld up to 1/2” steel using self-shielded Lincoln Innershield® wire (FCAW-S)."Harvdog has a Lincoln 180
Reply:I have not tried flux cored yet ill give her a whirl and maybe be able to see better penetration. and advice or differences then using the mig process?
Reply:DesertRider:   yes it canfred Originally Posted by DesertRider33 Can the Lincoln 180 mig drive .045 fluxcore wire?
Reply:so if i may what is the answer to my original question, knowing the machine is not "sufficient" for 1/4"
Reply:Originally Posted by harvdog31so if i may what is the answer to my original question, knowing the machine is not "sufficient" for 1/4"
Reply:Originally Posted by DesertRider33Interesting that Lincoln would rate the machine for 1/2" fluxcore in a single pass when their own NR211 wire in .035 size isn't even rated to 1/2".  Can the Lincoln 180 mig drive .045 fluxcore wire?   My 180 amp Passport and 175 amp MM175 dont have drive rolls available for .045 fluxcore and that wire size is not listed as one of the wire sizes the machine is made to work with.
Reply:that sounds more lik it. i can definately do that
Reply:Originally Posted by harvdog31that sounds more lik it. i can definately do that
Reply:Note:Lincoln NR-211-MP is rated for a MAX plate thickness of 5/16 inch with wire sizes up to 0.045.  That is a limit from the wire itself and has nothing to do with a machine's capabilities.  NR-211-MP in wire sizes greater than 0.045 is rated for a max plate thickness of 1/2 inch.The Lincoln 175 and 180 machines are capable of using 0.045 NR-211-MP FCAW-S wire and the machines do have 0.045 drive rolls available.  harv,Yes, you can weld one side and then flip the piece over  and do a little grinding and weld from the other side.  Just like Post #10 above stated.  The best laid schemes ... Gang oft agley ...
Reply:Originally Posted by MoonRiseLincoln NR-211-MP is rated for a MAX plate thickness of 5/16 inch with wire sizes up to 0.045.  That is a limit from the wire itself and has nothing to do with a machine's capabilities.  NR-211-MP in wire sizes greater than 0.045 is rated for a max plate thickness of 1/2 inch.The Lincoln 175 and 180 machines are capable of using 0.045 NR-211-MP FCAW-S wire and the machines do have 0.045 drive rolls available.
Reply:Originally Posted by harvdog31I have not tried flux cored yet ill give her a whirl and maybe be able to see better penetration. and advice or differences then using the mig process?