Bolt Hole Repair Coupon
Bolt Hole Repair Coupon
(OP)
Hello all. Thank you in advance for any information that you can share.
Every so often our facility needs to repair a bolt hole that was drilled in the wrong place. In the past we have qualified welding procedures to take corrective action. However the welder qualification is very difficult. We have gone through 30-40 coupons on several welders trying to pass these qualifications.
I am unsure if our hole design is best practice. What would a proper bolt hole repair coupon look like?

This picture is how we machine our coupons. I have read that it is easier to do it with a different shape, but I cannot think of where I saw that. Our biggest issue is only having one or two welders qualified to perform such a weld.
Any help will be greatly appreciated.
ASME Section IX
API 6A
Every so often our facility needs to repair a bolt hole that was drilled in the wrong place. In the past we have qualified welding procedures to take corrective action. However the welder qualification is very difficult. We have gone through 30-40 coupons on several welders trying to pass these qualifications.
I am unsure if our hole design is best practice. What would a proper bolt hole repair coupon look like?

This picture is how we machine our coupons. I have read that it is easier to do it with a different shape, but I cannot think of where I saw that. Our biggest issue is only having one or two welders qualified to perform such a weld.
Any help will be greatly appreciated.
ASME Section IX
API 6A





RE: Bolt Hole Repair Coupon
Have the welder qualify on a flat plate using the modified weld prep. Qualification can be done by sectioning through the coupon and ensuring complete fusion and penetration. This is all that is needed.
RE: Bolt Hole Repair Coupon
thread330-232318: Misaligned bolt holes repair
RE: Bolt Hole Repair Coupon
That tiny opening and small 60 degree opening angle isn't giving the welders enough room to get to the bottom of the hole with any accuracy and thoroughness.
RE: Bolt Hole Repair Coupon
RE: Bolt Hole Repair Coupon
Better yet. STOP putting the holes in the wrong place in the first place!
RE: Bolt Hole Repair Coupon
page 6 here -
http://www.alcoa.com/fastening_systems_and_rings/c...
RE: Bolt Hole Repair Coupon
RE: Bolt Hole Repair Coupon
How far out-of-position are the worst holes?
The largest catalog "solid" keensert is 1-3/8" requiring drilling a 'tap drill" sized hole of 1-5/16".
page 6 here -
http://www.alcoa.com/fastening_systems_and_rings/c...