The discussion centers on the effects of welding on fasteners, specifically bolts and nuts, and how welding alters their properties. Participants explore the implications of welding on the structural integrity and mechanical properties of these components, considering both theoretical and practical aspects.
Participants express various viewpoints regarding the effects of welding on fasteners, with no consensus reached on the specific outcomes or the extent of property changes. The discussion remains unresolved with multiple competing views on the implications of welding.
Limitations in the discussion include the lack of specific data on welding conditions and the complexity of factors affecting the mechanical properties of fasteners post-welding.
This discussion may be useful for engineers, materials scientists, and professionals involved in structural design and fabrication, particularly those interested in the effects of welding on fastener integrity.
You are posing a problem that is not possible to resolve with charts and tables. How much heat was applied during welding? What type of welder was used, and what is the operating temperature of the arc? How much of the bolt's surface was in contact with underlying metal, and what is the thermal conductivity of that metal? You can pile on complication on complication very easily with a bit of thought.CruiserFJ62 said:Does anyone know of a table shows annealed vs tempered&quenched steel properties? What is the decrease in yeild stress on a grade 8 bolt that is annealed due to the heat from welding?
turbo-1 said:You are posing a problem that is not possible to resolve with charts and tables. How much heat was applied during welding? What type of welder was used, and what is the operating temperature of the arc? How much of the bolt's surface was in contact with underlying metal, and what is the thermal conductivity of that metal? You can pile on complication on complication very easily with a bit of thought.
If the bolt is in its annealed state, it will have no more strength than a common fastener, and possibly less, since you might have created discontinuities in its internal structure that would make it prone to sudden complete failure, instead of just stretching/distortion that you might have gotten with a common fastener.CruiserFJ62 said:I'm not really trying to get an exact answer but an understanding of what the worst case would be if the material was in its annealed state?
turbo-1 said:If the bolt is in its annealed state, it will have no more strength than a common fastener, and possibly less, since you might have created discontinuities in its internal structure that would make it prone to sudden complete failure, instead of just stretching/distortion that you might have gotten with a common fastener.