Originally Posted by Karl
PJ,
The method I use involves stress relieving the head during the welding process as well as having the head pre heated(I don't want to say what I do as thats giving the game away) but it results in a very hard head face and is totally reliable.
To get surface hardness you must have to heat treat the head? i don,t know of any alloy filler rod that will work harden with what ever surface finish/ prep you give it.
I weld the cylinder bores on 2 stroke cylinders prior to the surface being Re plated ( Ceramic coating) and know only to well how this affects the strength of the substrate alloy.