Hmm I need more info on this.DieselBoost wrote:My m21 head is welded up fully... it was cracked from every place...
good way to weld those is
1. open those cracks fully with grinder
2. then heat up the head
3. weld it
4. heat up again
5. very slow cooling
How hot do you heat the head?
Do you weld it hot?
Do you allow it to cool fully before heating it up again?
I had this idea using a home oven but I had not heard of this technique before. Heating, welding in 10 minute "bursts" to keep the head from cooling too much and putting it back in the oven so each weld is done while the head is hot. Then putting it in the oven and turning the temperature down every hour and allowing it to cool overnight inside the oven, maybe with some bricks inside to retain heat.