Join Date: Mar 1999
Location: The Island of Luzon
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The Pinch Welds Flanges are there for:
SPOTWELDING! Pinch the stack of body panels together and hit them with the spotwelder (sometimes called 'pinchwelder')...
One of the most common practices car preparers use to prep old cars is to trim pinch welds. In the old days, especially in American Cars the pinch weld flanges were HUGE. I personally know if you trim the pinch weld flanges to a 'non-tech inspector suspicious' 1/4" wide with edge-fusion welding and through-spot welding using a MIG on a 1966 Corvair you will save 13# off the weight of the unit-body.
The purpose of the pinch weld flanges was to allow for panel fit differences when put together in manufacturing. You will note they usually have several different lengths of metal sticking out of them--in an ideal world, they will be all the same like a deck of cards on edge. Once you get to that point, you can start cutting down the width of the flange as your panels are consistent. Japan was lightyears ahead of Detroit at this point in automotive assembly history for unit-bodies (even Chrysler) and as a result the flanges are CONSIDERABLY narrower (go look under a 1972 Dodge Dart in similar areas, 1/2 to 3/4" wide!)
Personally I use the Crescent-Wrench straightening method if they are really mangled.
You need them for the stock jack to be safely used (they CAN AND DO slip out if things are not all squared...it is not a pretty happening! Seen that firsthand!) The factory jack has that slot for positive location utilizing the pinchweld flange... it's not to really protect it outside of the fact that if the stock jack crushed it, then the indexing feature was useless (remember it shows putting it between the two water-drain-hole bumps in the pinch weld?)
As stated, idiots with lifts and standard jacks just mashed them flat lifting the car using the factory 'jacking points' but that is not necessarily a factory 'lifting point'! In some cases, nowadays you can get lifting saddles that allow the use on pinchwelds as some late models have concurrent lifting/jacking points.
What has been will be again, what has been done will be done again; there is nothing new under the sun -- that means
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If I throw a dog a bone, I don't want to know if it tastes good or not. -- Brick Top
Canadians don't get it. Period. End of discussion.
Last edited by Tony D; 02-26-2015 at 05:35 AM.