Quote:
Originally Posted by johnneilson
Pete,
do you know what alloy rod was used?
J
|
Yes, ER70.
TO ALL OF THE OTHER PEOPLE. Have you ever heard of modern technology like ultrasonic thickness gauges????
It will tell you the thickness of the metal surrounding the area to be patched and in some cases (depending on the cost of the gauge), the condition of it. This determines the size of the patch. You can't weld to rust and scale.
And yes, I am aware of low temperature TIG welding with bronze alloy rods. It works sometimes but if the cast iron is extremely dirty or had oil embedded in it, that type of filler rod tends to bubble and then you have to go back over the area a second or third time.
A pinned in patch will work good, IF, the surrounding area is thick enough to hold the screws. I have "stitched" patches a foot across into the crankcases of D9 Cat engines several times and they are still running 25 years later.
We didn't have the welding technology back then but that would have worked also.