locking rear diff hot or cold?

[shity old hilux]

Im welding up my rear diff in my new landcruiser. Shuld i make the diff head as hot as i canbe 4 i weld it?

[tow99]

I normally just heat things until they are hot to the touch. i.e hot coffee . How are you welding it? I have heard of people arc welding the spider gears with a special rod but can't remember what made it work better than standard rods

[Tarmac]

Def hot, try the spit test - when you spit on it and it bubbles its over a hundy celsius on the surface

[Mazuki]

Hi-ten eight arc welding rods would suit hardened or tough parts. And pre heating will help with penetration. And be sure to not quench or cool the parts quickly.