BarrieJ
Member
- Messages
- 891
- Location
- Milton Keynes, Bucks, United Kingdom
Over the years I've welded in most positions and with various pieces of kit, I've bronze welded cast iron parts with success but I've never been called on to weld it.
Now retired, access to professional kit has gone but I've got my old reliable 200 amp Cytringan oil filled arc welder which has served me well for at least the last thirty years and never missed a beat.
I've recently been asked if I could build up the exhaust 'lug' on this Ford cylinder head. The weld itself appears straightforward enough with little more than runs of 20mm max and where the lug has crumbled away (apparently not uncommon on this engine), there is easy access for cleaning the weld area prior to welding and peening it/dressing it after.
My concern is the tapped hole that once accommodated the stud; there's sufficient thread to wind a stud in and weld over it but then the stud becomes a permanent fixture.
Does anybody think that taking a bolt of appropriate size and thread, cutting the head off and centre drilling it on the lathe, winding it into the broken lug, weld in place, dress weld, then re-drill the bolt to the appropriate tapping size and re-cut a new thread to match the old? I accept that there's a risk of the new thread not picking up on the old and am unsure whether this is a sound procedure.
1). Are there better solutions?
2). Presumably a nickel ferrous rod on a fairly low amperage would do it without pre heating?
3). Would the weld metal affect the host metal to a degree whereby cutting a new thread would be difficult/impossible?
I'd be most grateful for members advice and apologies for the poor quality of the photograph.
Many thanks for your input.
Now retired, access to professional kit has gone but I've got my old reliable 200 amp Cytringan oil filled arc welder which has served me well for at least the last thirty years and never missed a beat.
I've recently been asked if I could build up the exhaust 'lug' on this Ford cylinder head. The weld itself appears straightforward enough with little more than runs of 20mm max and where the lug has crumbled away (apparently not uncommon on this engine), there is easy access for cleaning the weld area prior to welding and peening it/dressing it after.
My concern is the tapped hole that once accommodated the stud; there's sufficient thread to wind a stud in and weld over it but then the stud becomes a permanent fixture.
Does anybody think that taking a bolt of appropriate size and thread, cutting the head off and centre drilling it on the lathe, winding it into the broken lug, weld in place, dress weld, then re-drill the bolt to the appropriate tapping size and re-cut a new thread to match the old? I accept that there's a risk of the new thread not picking up on the old and am unsure whether this is a sound procedure.
1). Are there better solutions?
2). Presumably a nickel ferrous rod on a fairly low amperage would do it without pre heating?
3). Would the weld metal affect the host metal to a degree whereby cutting a new thread would be difficult/impossible?
I'd be most grateful for members advice and apologies for the poor quality of the photograph.
Many thanks for your input.