Normal for new laser cut flanges to be warped?
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From: silver spring, md, USA
Normal for new laser cut flanges to be warped?
I just received a laser cut f20c flange from precision power parts. The problem is that it is warped about 1/16" in the middle. The heat affected range around where the laser cut is very small, so it seems strange why a 3/8" flange would warp that much. What do you guys think?
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Junior Member
Joined: Jan 2008
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From: silver spring, md, USA
Re: (ebydrc)
okay i see. well when I weld it I think I'll just weld it on the convex side so it'll warp back closer to flat. I also see how some people cut the flange along the bolt holes so the flange is separated into 3 sections. That would help the flange seal better once i'm done welding right?
Honda-Tech Member
Joined: Feb 2004
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From: Tampa, FL
Re: (RCautoworks)
depends on the sheet that they are cutting them from, but they are usually warped, especailly if they are stainless.
i would straighten that before you weld it.
if you have access to a shop press, use that to straighten it. works like a charm.
bmc surfaces all of their flanges
i would straighten that before you weld it.
if you have access to a shop press, use that to straighten it. works like a charm.
bmc surfaces all of their flanges
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Joined: Nov 2002
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From: Illinois
Re: (manifoldmiketyson)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by manifoldmiketyson »</TD></TR><TR><TD CLASS="quote">
bmc surfaces all of their flanges </TD></TR></TABLE>
And takes months to send you them.
bmc surfaces all of their flanges
</TD></TR></TABLE>And takes months to send you them.
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OG Fabricator
Joined: Feb 2005
Posts: 1,864
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From: Burlington, Ont., Canada
none of my flanges go out if they are warped.
i'd recommend making a thick plate to bolt it to when you weld the runners onto it... it should flatten out a bit if you let it cool on the fixture.
i also recommend re tightening head studs on manifolds after you heat cycle them the first couple times. that is to say, re tighten the studs while it is still hot so it will cool flat. i've done this in the past with my own personal manifolds and 1/2" flanges that were warped more than 1/16" and it came off glass flat afterward.
i'd recommend making a thick plate to bolt it to when you weld the runners onto it... it should flatten out a bit if you let it cool on the fixture.
i also recommend re tightening head studs on manifolds after you heat cycle them the first couple times. that is to say, re tighten the studs while it is still hot so it will cool flat. i've done this in the past with my own personal manifolds and 1/2" flanges that were warped more than 1/16" and it came off glass flat afterward.
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Joined: Aug 2003
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From: TDCperformance.net
Re: (weiRtech)
A lot of the problems with the metal itself is thats its not flat to begin with. sad part is on 3/8 plate ASTM tolerance is like about 1/4 inch every 24 inches 
fortunatley we use 1/4ASTM tolerances and will not send out material like that
our steel is heat treated->quenched-->tempere-->hot levelled @2400+tons with backup rolls-->cooled-->sheared-->shot blasted-->stenciled, labeled, tagged, inspected and shipped
3/8th heat treated plated 240inches by 96 inches wide=12-15,000.00
but its flat, wont warp, and is in an "armor" classification
fortunatley we use 1/4ASTM tolerances and will not send out material like that
our steel is heat treated->quenched-->tempere-->hot levelled @2400+tons with backup rolls-->cooled-->sheared-->shot blasted-->stenciled, labeled, tagged, inspected and shipped
3/8th heat treated plated 240inches by 96 inches wide=12-15,000.00
but its flat, wont warp, and is in an "armor" classification
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Joined: Mar 2002
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From: Calgary, AB, Canada
Re: (socalismylife)
I always get my el'cheapo hot rolled plasma cut flanges made 5/8" so there is room for me to machine after welding. The ones i get done locally are almost always warped.
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From: Youngstown, OH, USA
Re: (legendboy)
bolt it to the head or a flat surface that will hold it flat, then build your manifold. When your done all the runners will actually hold it in place. When you dismount the flange from the head then it will hold, then when u run the manifold a few times, the heat will conform it & the stress will be releaved 
OG Fabricator
Joined: Feb 2005
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From: Burlington, Ont., Canada
Re: (socalismylife)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by socalismylife »</TD></TR><TR><TD CLASS="quote">hey I sent you a reply but you never got back to me. I was going to order from you at first.</TD></TR></TABLE>
my apologies. best bet is to email or call if you don't get a pm response within 12 hours.
my apologies. best bet is to email or call if you don't get a pm response within 12 hours.
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Joined: Nov 2004
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From: phoenix, az, usa
Re: (2kjettaguy)
warping also has to do with the type of steel used. Most of the milled out flanges are made from cold rolled steel which is a far superior steel when compared to hot rolled steel. You cant get cold rolled steel in plate form ( 48"x96" plate) it only comes in bar stock. I have cut both types of steel on my waterjet , the same part from both types of steel and the hot rolled came out warped where as the cold roll came out perfectly flat.
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