The AASHTO/AWS D1.5 - 2015 Bridge Welding Code defines repair welding as any welding, including removal of weld or base metal in preparation for welding, necessary to correct unacceptable discontinuities in materials or workmanship.
My experience with fabrication and welding of steel structures has presented some unique and challenging weld repair experiences. These experiences have included making weld repairs of many structures under the adverse conditions that can exist in the field whether it is the repairing of electroslag welds in tension members, the repair of a 50,000 ton press girder which had a major fatigue crack or the repair of an erected 1,200 foot radio tower during the winter months. There are many more diverse welding and fabrication problems that have presented themselves over the years but these are unique in that they show how one can overcome even the most demanding of repair challenges.
It is the intention of this presentation to show that making a weld repair no matter how complicated or difficult can usually be done with a 100% degree of success. We will dispel the myth that exists which says when you make multiply repairs in the same location the steel will lose its strength and the piece will have to be scrapped or that the weld repair is never as strong as the original base metal. Examples will be presented of repairs that will touch on the problems associated with improper filler metal storage and handling procedures, inadequate preheat and interpass temperature controls, and using the wrong welding techniques when making repairs.
In closing, I would like to emphasize that welds can be repaired with confidence in the fabrication shop under favorable conditions and in the field under less favorable conditions. The examples presented today have concentrated on field welding problems and their solutions; however, it should be noted that as demonstrated in this presentation that welding in conformance with the requirements of the AWS D1 Codes will result in acceptable weld repairs no matter what the situation.
David L. McQuaid P.E.
- Is a graduate Civil Engineer and Licensed Professional Engineer in multiple states.
- Has been working in the steel fabrication, welding and construction industry for over 45 years.
- Started the Company DL McQuaid & Associates and is President since 2000.
- Worked as an American Bridge Engineer for over 31 years.
- Is a member of the AWS D1 Main Committee and has been so for over thirty years.
- Chairman of the AWS D1.5 Bridge Welding Code and has been a member of the Committee for over 20 years.
- Member of the AWS Board of Directors Since 2006.
- President of the AWS Board of Directors.
- Has primarily been involved with welding and resolving welding problems since 1970.