Bend Before Weld 101...

admin

Good opportunity to show you what it's all about..Had some stainless flat plate to be welded to some 1" 304 tubing.."Try to keep the plate as flat as possible""Yeah whatever"Ok here is the pieces..Gotta be cleaned...And loose the lable.. Easy to keep in the middle because they are held in with flat head scrwes..3/32 70s for our spacer..Clamp edges with filler down the middle..Next post.....zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:More bending pics for diffrent views..OK..Tack in 3 places starting with the middle..Do both sides..Now weld..Now for the results next post.....zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:Ahhhhhhhh See how nice and flat it stays??Look close..you can see my mask between the piece and the scale..But as you can tell..It's within .010 ..Other end..The key to this is to not unclamp it right away..Give it 5 mins or so to cool down and you'll get results like this every time.. I get all the fun jobs... ...zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:What's the reason for the spacer?  Warping?  If so, why does it work this way?
Reply:Originally Posted by jjsjeffWhat's the reason for the spacer?  Warping?  If so, why does it work this way?
Reply:Originally Posted by jjsjeffWhat's the reason for the spacer?  Warping?  If so, why does it work this way?
Reply:Why prebend the plate?Because the weld will try and 'tighten up' (contract) as it cools, which will then warp the formerly flat plate into a U shape.By prebending the plate in the OPPOSITE direction, zap has countered the warpage effect of the cooling weld beads and ended up pretty much flat.  btw zap, the screw holes look off center in Post #2 first pic.     You might want to double check the side-to-side placement of the tube to make sure all is OK in the final weldment.  The holes are probably right on in the plate, but weren't TDC in the tube when drilled-n-tapped.  Or else they got crooked and ended up not perpendicular to TDC.  Might make a difference in the final piece, might not.
Reply:Those are chads from drilling the holes and threads of the bolt/screw peekin' out. Optical dillusion maybe? Besides, perhaps it came in that way?City of L.A. Structural; Manual & Semi-Automatic;"Surely there is a mine for silver, and a place where gold is refined. Iron is taken from the earth, and copper is smelted from ore."Job 28:1,2Lincoln, Miller, Victor & ISV BibleDanny
Reply:Originally Posted by tanglediverOptical dillusion maybe?
Reply:Ah come on, that ain't a challenge.  The challenge is welding a 10x6 1/4 inch wall tubing, 10' long, welding 9 tool bar mounts on it.  Keep that straight.It takes a bottle jack and about a foot of arch in it to keep it straight.
Reply:I like the first picture with the dime in it... it looks like Roosevelt is checking out your weld Sure, I can fix it... I got a welder!!!
Reply:Originally Posted by AntiblingAh come on, that ain't a challenge.  The challenge is welding a 10x6 1/4 inch wall tubing, 10' long, welding 9 tool bar mounts on it.  Keep that straight.It takes a bottle jack and about a foot of arch in it to keep it straight.
Reply:There ya go Zap ............Thats how its done.I build king pin plates for semi trailers and i pull the 3' X 4' x 1/2" plate down a little over a 1/2' all the way around before doing a triple pass on the king pin to the plate and weld the roller bungs on , lets the clamps loose after welded and you get a nice flat master hitch plate. Good post brother man.
Reply:Neat trick Zap - that will be tucked away for later!Fire!, Fire! Oh wait, that's my torch...Lincoln PT-225 TIGLincoln 175 MIG
Reply:way to use the old nog nog you gotta know what it wants to do before it does what its gonna do when ya do whatcha gotta do  nicewelds as always350P 30A spool gun cut master 51  syncro 250 other stuff " take a dog off the street and make him prosper and he will not bite you sad the same cannot be said for man" i didnt use punctuation just to piss you off
Reply:I can see what you mean moonrise. the filler that zap used as a spacer is a little off centre, but it looks like it worked none the lesshttp://datingsidorsingel.com/
Reply:Great tip, thanks.
Reply:Good lesson to keep in mind.
Reply:When you release the clamps, the weld relaxes some.  Does this mean there is now less tension across the face of the weld?355# Hay Budden3# Hofi HammerPropane ForgeIdealarc TIG 300/300AllStates Oxy Propane torchSmith Little Torch
Reply:Originally Posted by maddogWhen you release the clamps, the weld relaxes some.  Does this mean there is now less tension across the face of the weld?
Reply:Originally Posted by maddogWhen you release the clamps, the weld relaxes some.  Does this mean there is now less tension across the face of the weld?
Reply:btw zap, the screw holes look off center in Post #2 first pic.  You might want to double check the side-to-side placement of the tube to make sure all is OK in the final weldment.
Reply:Just an observation, but it must not be real critical anyway, since you are contaminating the stainless with all that mild steel all over it.SA200,Ranger8,Trailblazer251NT,MM250,Dayton225AC,T  D-XL75,SpoolMate3545SGA100C,HF-15-1  RFCS-14 When I stick it, it stays stuck!
Reply:Originally Posted by mooseyeJust an observation, but it must not be real critical anyway, since you are contaminating the stainless with all that mild steel all over it.
Reply:Originally Posted by mooseyeJust an observation, but it must not be real critical anyway, since you are contaminating the stainless with all that mild steel all over it.Isn't that stainless steel you are working with? Isn't that table carbon steel your are working on?Isn't that tig wire carbon steel?Scratching stainless or even grinding dust from carbon steel will and does contaminate stainless and can cause the stainless to begin rusting. Even using the same tools and especially brushes is a no no.SA200,Ranger8,Trailblazer251NT,MM250,Dayton225AC,T  D-XL75,SpoolMate3545SGA100C,HF-15-1  RFCS-14 When I stick it, it stays stuck!
Reply:Originally Posted by VipernutNeat trick Zap - that will be tucked away for later!
Reply:you can teach most enyone to put down a nice looking bead but the real welder knows these tricks from experiance and years of trial and erra,   nice job done well
Reply:Originally Posted by asemasteryou can teach most enyone to put down a nice looking bead but the real welder knows these tricks from experiance and years of trial and erra,   nice job done well
Reply:Actually, its pretty basic material handling 101. It holds true for all alloys, including Aluminum. Most professional shops have a separate building  or at the very least, area of the shop and tools for alloys.SA200,Ranger8,Trailblazer251NT,MM250,Dayton225AC,T  D-XL75,SpoolMate3545SGA100C,HF-15-1  RFCS-14 When I stick it, it stays stuck!
Reply:hmm,... interesting... so let me make sure im understanding this correctly... that means that shop would have a building or area for copper, brass, steel, stainless, etc..etc..??  wow, that's a hell of a shop.
Reply:Originally Posted by mooseyeActually, its pretty basic material handling 101. It holds true for all alloys, including Aluminum. Most professional shops have a separate building  or at the very least, area of the shop and tools for alloys.
Reply:Originally Posted by slamdvwhmm,... interesting... so let me make sure im understanding this correctly... that means that shop would have a building or area for copper, brass, steel, stainless, etc..etc..??  wow, that's a hell of a shop.
Reply:I don't think that part is going on the space shuttle, mooseye.
Reply:So how do you know how much to prebend?
Reply:Originally Posted by scott brunsdonSo how do you know how much to prebend?
Reply:Originally Posted by TSORI don't think that part is going on the space shuttle, mooseye.
Reply:Good point to keep in mind on "cross contaminating" one metal with another.I don't think it applies in Zap's case because he is not forcefully grinding/rubbing/galling/pounding/etc. carbon steel in contact with the stainless.As I understand it, carbon steel contamination of SS is primarily a problem with things like grinding and power wire brushing where the grinding wheel is loaded with CS or the brush is made of CS.  Different metals like CS, SS, Al need to use dedicated grinding wheels and brushes.
Reply:Originally Posted by TSORI don't think that part is going on the space shuttle, mooseye.
Reply:I've been mostly reading around learning a lot from the site and thought I post on this subject since I have some knowledge. My dad's friend owns an electro-polishing plant in Baltimore, MD and I've spent a lot of time there, he taught me how to weld there. If it was a critical part like for pharmaceuticals, they usually have it electro-polished.  It involves pickling like stated above and it removes all contaminates and makes the stainless shine. Most of the stuff they do is pharmaceuticals. Oh yeah it only works on stainless.
Reply:Mooseye wrong. you do know you can weld stainless to low carbon steel (atleast in my experiance, never tried anything else). I don't exacly see how small particles of steel on the surface of stainless steel are going to make a difference the chromium oxide still coveres the surface and it will cover any small impurities (microscopic), after all stainless is steel with addatives.
Reply:Originally Posted by matMooseye wrong. you do know you can weld stainless to low carbon steel (atleast in my experiance, never tried anything else). I don't exacly see how small particles of steel on the surface of stainless steel are going to make a difference the chromium oxide still coveres the surface and it will cover any small impurities (microscopic), after all stainless is steel with addatives.
Reply:Originally Posted by matMooseye wrong. you do know you can weld stainless to low carbon steel (atleast in my experiance, never tried anything else). I don't exacly see how small particles of steel on the surface of stainless steel are going to make a difference the chromium oxide still coveres the surface and it will cover any small impurities (microscopic), after all stainless is steel with addatives.
Reply:For us average hackers does it really matter?When I did Military work we all had our "cube"We all had a 1 1/2" thick Aluminum "Jig Plate" for your tabletop and it did not matter what you were welding..Oh well.....zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.