详情

原文传递 Repair of Galvanizing After UIT Application. Technical rept. (Sept 203 - June 2005).

题名：	Repair of Galvanizing After UIT Application. Technical rept. (Sept 203 - June 2005).
作者：	FRANK, K. H.; PALMATIER, A. H.
关键词：	Galvanizing-; Traffic-signal-supports; *Repair-.;Fillet-welds; Welded-joints; Zinc-; Hot-dip-coatings; Heat-treatment; Fatigue-life.
摘要：	Ultrasonic Impact Treatment (UIT) to the weld toe of a galvanized mast arm removes the galvanizing in the treated area. UIT is applied to increase the fatigue performance of the mast arm by introducing compressive residual stresses at the treated weld toes and reshaping the intersection of the weld toe and the arm to reduce the local stress concentration. In order to prevent corrosion at the treated area, the weld toe must be recoated. There are various methods that can be employed to repair the treated area. The first method of repair is the application of zinc rich paint. Previous test results show that mast arms treated with a zinc rich paint after UIT application behave the same in fatigue as mast arms with UIT application without coating. The second method of repair is regalvanizing the treated arm in a hot-dip galvanizing bath. Previous tests show that hot-dip galvanizing after UIT application removes the benefit of UIT. A third method of repair uses a zinc-lead solder. The zinc-lead solder is applied to a heated surface at a working temperature of 600 degrees F to 750 degrees F, at which point the solder melts upon solidification repairs the galvanized coating.
报告类型：	科技报告