You do not want to heat a new area of metal before the preceding area has cooled so be patient.
How to shrink sheet metal with heat.
Propane can do the same thing although it is a much more crude method.
Get used to this idea and your abilities will grow.
Need a fix for oil canning auto body panels.
Do not over heat the steel.
Heat to blue only and shrink that much.
If you ve done it right this action will cause the metal to pucker on the edge and give you a little ripple or ridge.
The bulge can then be tapped down flat with a hammer and dolly to thicken the metal in that spot.
At 550 degrees f you can shrink the aluminum without affecting the temper or hardness.
Why not just heat it and gently hammer the swell down.
Heating up metal and throwing cold water on it may shrink it a tiny bit but it makes distortion and hard steel.
In this very short video i will show you how to repair shrink sheet metal and stiffen body panels the easy wa.
A common recommended fix is to use oxy acetylene heat to create a localized hot spot that bulges the metal above the mean surface of the panel.
Then take your teardrop mallet and make one hard blow on the metal driving down and towards the outside of the bowl.
Welding suppliers carry a wide.
Start by placing the sheet metal over the bowl so it covers the bowl and lays as flat as you can hold it.
This takes away some of the stretch.
Start by heating a small area around the size of a dollar coin in a tight circular motion working into the centre to give the metal a cherry.
This works the other doesn t.