thick to thin plate

[God mode restorations]

good evening all...
this afternoon i had some time to do some practice welds of 3mm plate to 1.5 mm plate...and for my first attempt i think all is good..seem to have good penetration of both pieces and with no blown holes and minimal distortion...what do you guys think....

 

[Steve Gray]

Looks pretty good, maybe a tad cold in places?. why the 3mm -1.5mm plate? Just an exercise or is it part of something your doing??

 

[BrokenBiker]

not too bad. Next try welding the thick wall box section to a sheet of 1.5 without anything else welded to it as backing

 

[God mode restorations]

ok cool..well the reason is i love drag racing..and planning to build my own pro street motor..the 3mm will act as a spreader plate and the 1.5mm will be inside sill that the spreader plate is welded to...at the moment i am experimenting with lots of different techniques to find what works best for me...
thanks...

 

[Steve Gray]

Cool!! All the best with the build mate, im also car mad lol.

 

[God mode restorations]

thanks...cool cool...what you got..anything exciting ....

 

[Steve Gray]

Nothing at the moment, just my daily driver a audi 20v turbo that ive tinkered with. Nothing as exciting as your motor.

 

[God mode restorations]

sounds good....audi a good motor...yes i have a few motors ...to many to be honest....

 

[Liquid Metal]

Couple of things to try which would make a better job of it:

Firstly, Rather thn have so many stop/starts along each side, try to weld each side in a continuous pass. Each stop/start is a potential weak point, especially with dip transfer mig welding.
Secondly, due to the potential weaknes in a stop/start, dont start or finish your welds on corners. Best practice is to start 10mm or so, away from corner, then weld to the corner, around it and then progress along the side. When you come to the next corner, stop 100m short of it.

 

[God mode restorations]

hello liquid metal...
sorry..i only just read your reply...thanks for the information..i only did it with that many stop starts just to keep the heat down so i dont distort the metal.but will give it a go....thanks...