In Process Reduction of Residual Stresses in a Weld. (ISPR-Process).

High residual stresses a metal joint can be harmful in static and/or dynamic loading. Resultant stresses under unfavorable conditions, have caused losses of structure and human life. The main investigator developed IPSR (In Process Stress Relief)-Process that produces a weld joint without residual stresses or with low acceptable residual stress. Low frequency low stress cycles were applied during welding for a weld in A1 alloy 5058. It reduced residual stress by over 12,000 psi. In this proposal parameters specific to IPSR-process (Proposer's US Patent # 4,386,727) will be separated for selected alloys; The IPSR-Process will be a component of a Welding Power Source. The main investigator is a mechanical and metallurgical engineer, holds M.S. in welding, has six patents in related areas and is assisted by a metallurgical engineer and a Professor from UC, Davis CA. The process is pervasive in nature with strong commercialization indicators. Anticipated Benefits: Post-weld stress relieving operations will be rendered unneccessary, making dramatic savings in cost, time and capital investment. ANy product such as a space ship, a deep sea cruising submarine, a bio-medical implant or a component of a nuclear reactor will be manufactured with welds with low residual stress level in process.