Oooooo Careful...........

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No metal was harmed in the filming of this sequenceGot the old welded on mounts off the truck frame today.Tongue sticking out of mouth, eyes squinting, fingers crossed, .........toes too.045 razor wheel on either a 6" grinder, or a 4.5" grinder when clearance dictated.I found that cutting nearly thru one side, and either reducing the opposite weld by careful grinding, or just leaving it intact seemed to work best.  A cold chisel was then inserted into an unwelded gap, and hammered to act as a wedge.  It did very well at popping the nearly cut weld loose, then the rest was hammering to open and close a hinge on the other side.  The opposite side weld eventually broke.Here's the nifty thing.  Instead of actually cutting THE WELD.  I found that cutting "above" the weld, in the mild steel, at a steep angle, weakened the joint enough to give loose.  A36 steel will yield faster than 60-70k filler material.  Plus you don't risk getting into the parent metal. If you're careful  I do not want to have to fill voids in this frameVery hot and humid.  Full googly goggles, hat, ear protectors(mickey mouse style), and I forgot to take WIP  pics.  Too uncomfortable to think of pics.  But you should get the technique by looking at the cut pieces.#1.... cutting thru a bead, actually mostly above the bead#2..... the bead that was left intact, which later became the hinge#3..... the method used#4..... the results Attached Images"Any day above ground is a good day"http://www.farmersamm.com/
Reply:Did an old dog just learn a new trick?
Reply:Originally Posted by BoostinjdmDid an old dog just learn a new trick?
Reply:CAREFUL grinding to reduce the weld profile, followed by final leveling with a 60 grit flap wheel"Any day above ground is a good day"http://www.farmersamm.com/
Reply:That's why I love a scarfing/gouging tip. You can cut thru the weld and the metal you don't want to save w/o touching the metal you want to save.                        JMHO,                                  MikeOl' Stonebreaker  "Experience is the name everyone gives to their mistakes"Hobart G-213 portableMiller 175 migMiller thunderbolt ac/dc stick Victor O/A setupMakita chop saw
Reply:Originally Posted by mla2ofusThat's why I love a scarfing/gouging tip. You can cut thru the weld and the metal you don't want to save w/o touching the metal you want to save.                        JMHO,                                  Mike
Reply:Umm.....excessive heat like that would not be good for the frame. You did good, Sam.QamuIs Heg qaq law' lorvIs yInqaq puS
Reply:Originally Posted by mla2ofusThat's why I love a scarfing/gouging tip. You can cut thru the weld and the metal you don't want to save w/o touching the metal you want to save.                        JMHO,                                  Mike
Reply:Originally Posted by admsweldingEven better.You should try a K4000 w/450amps+80psi air behind it.
Reply:Originally Posted by farmersammI have a scarfing tip that I've used occassionaly, but haven't had too much luck with it.It may be the angle I'm using, or something else, but the preheat is miserable.  A devil to get the cut going.This near to the frame I've (probably obsessively) been worried about any excessive heat input too.  I've also had the sad experience of the O2 stream diverting and cutting stuff that you don't want to cut
Reply:Most people that haven't used a scarfing tip much try to use it backward.   the molten metal you are blowing out is much hotter than the flame itself. you want to scarf the metal out ahed of your tip. in other words move righ into the molten puddle,  that usually preheats your next scarf.IF IT WORKS, DON'T FIX IT2 Lincoln CV-300 / LN-7 GMALinde-VI 253,400 & 450 w/MIG35 feedersCNC Table with Oxweld O/A & Hypertherm 1250G3Lincoln Ranger GXT 250Hobart-MicroWire 300ESAB Heliarc 161ESAB-Mobilemaster 2 CC/CV Feeders& more
Reply:Originally Posted by millman52Most people that haven't used a scarfing tip much try to use it backward.   the molten metal you are blowing out is much hotter than the flame itself. you want to scarf the metal out ahed of your tip. in other words move righ into the molten puddle,  that usually preheats your next scarf.
Reply:If you're very, very careful, you can save the spring perches w/ the scarfing tip. Due to the width of the kerf it makes it takes lots of practice to cut out only the weld. If trying to save metal on both sides of the weld, I try to cut out MOST of the weld and use a cold chisel to break the remains of the weld loose. Try welding some pieces of scrap together,first flat and then at right angle to each other and scarf out those welds before trying to remove the spring perches.                               JMHO,                                          MikeOl' Stonebreaker  "Experience is the name everyone gives to their mistakes"Hobart G-213 portableMiller 175 migMiller thunderbolt ac/dc stick Victor O/A setupMakita chop saw
Reply:Originally Posted by PookieI am currently needing to cut some spring perches off of a Dana 44 axle to relocate under a Jeep.  I was told that a scarfing tip would be perfect for the job.  It was explained that the tip was typical of any other tip, with the exception of a bow.  Is that not correct?
Reply:First, my apologies to Samm for hijacking this thread over the scarfing tip. For a few yrs before I retired I noticed a lot of younger weldors didn't know what a scarfing tip was for. They thought it was for cutting around a corner. The way I was taught is to lay the tip down parallel to the weld, starting at the end of weld. Preheat and cut out the weld as far as the oxy stream will reach, usually 1 1/2"- 2 1/2", stop cutting, move tip up where cut stopped, preheat again and start cutting again. W/ practice and depending on weld quality, you'll get so can keep moving ahead while cutting. As I said before, if you're careful you can cut out the weld and save enough of metal on each side of weld to reuse them. If you only want to save one side, then concentrate cutting on the "waste" side and only cut it and the weld out.  OK, Samm, that's all I'll say here. If anyone else has questions/comments, I suggest we start another thread.                                     HTH,                                            MikeOl' Stonebreaker  "Experience is the name everyone gives to their mistakes"Hobart G-213 portableMiller 175 migMiller thunderbolt ac/dc stick Victor O/A setupMakita chop saw
Reply:There is no such thing as a hijack on any thing I put up.Discussions range far and wide.  At least the good ones do"Any day above ground is a good day"http://www.farmersamm.com/