Preheat Temperature for Preventing Root Cracking in Continuous Multi-Pass Welding
نویسندگان
چکیده
منابع مشابه
experimental determination of residual stresses in multi-pass girth welding of thermo-mechanical steel pipe
in this paper, two api x70 steel pipes (with spiral seam weld) of 56 inch outside diameter and 0.780 inch wall thickness were girth welded first. next, hole drilling tests were conducted for strain measurement on the surfaces of the pipes. the values of residual stresses on the internal and external surfaces of the pipe were determined, from strain data using astm 837 standard. the experimental...
متن کاملEffect of Thermal Cycle on Properties of Welding Heat Affected Zone
In this report T-T-T diagram and CCT-Curve from austenitizing temperature 1200•Ž were researched and then effects of preheat temperatures and welding thermal cycle on properties of heat affected zone were clarified to investigate weldagility of 21/4 Cr-1Mo steel and also we carried out a restraind crack test to investigate crack sensitivity of the steel. The results of experiments are summarize...
متن کاملDesign Guidelines for Preventing Flex Cracking Failures in Ceramic Capacitors
Surface mount multilayer ceramic capacitors (MLCCs) are one of the most common components found on modern circuit card assemblies. Introduced in 1977, they are well known for their reliability and have been rapidly accepted by the electronics industry. The reliability of a nominal MLCC is extremely high, with expected operating lifetimes in the decades, if not hundreds of years. However, to att...
متن کاملEffects of weld preheat temperature and heat input on type IV failure
Type IV cracking refers to the premature failure of a welded joint due to an enhanced rate of creep void formation in the fine grained or intercritically annealed heat affected zone. A great deal of research effort has been directed at understanding the underlying mechanisms for this type of failure, but most have approached the problem from a metallurgical standpoint, and comparatively little ...
متن کاملLiquation Cracking of Dissimilar Aluminum Alloys during Friction Stir Welding
A liquation cracking mechanism of dissimilar Al alloys during the friction stir welding (FSW) is suggested in this study. To identify the mechanism, the precipitates were analyzed and Al-Mg-Cu phase diagrams were calculated. Electron backscattering diffraction (EBSD) analysis and electron probe microanalysis (EPMA) were also conducted. In the same manner as constitutional liquation, at high hea...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of the Society of Naval Architects of Japan
سال: 1987
ISSN: 1884-2070,0514-8499
DOI: 10.2534/jjasnaoe1968.1987.390