Based on the offshore standard DNV-OS-F101-2010,girth welding tests and girth weldability evaluations were carried out for the X65 and X70 UOE submarine pipelines of 3 wall thickness gauges,in which semi-automatic gas...Based on the offshore standard DNV-OS-F101-2010,girth welding tests and girth weldability evaluations were carried out for the X65 and X70 UOE submarine pipelines of 3 wall thickness gauges,in which semi-automatic gas metal arc welding （GMAW） was adopted matched with metal powder flux cored wire. The girth welding procedure specification （WPS） was optimized to obtain good quality and cold-crack-free girth weld joint without preheating and post-weld heat treatment. At the same time, porosities, inclusions and incomplete fusion defects were avoided. Girth weld joints were evaluated for tensile strength, bending, Vickers hardness, charpy impact toughness and crack tip opening displacement （CTOD） fracture toughness. Results show that all the girth weld joints have good mechanical performances,indicating that the irth weldabilitv of Baosteel＇ s UOE submarine pipelines is excellent in the case of semi-automatic GMAW.展开更多
Based on API STD 1104-2005 and CSA Z662-2007, field girth welding tests and girth weldability evaluations were executed for three types of wall thickness X70 UOE pipeline, in which the most popular main line girth wel...Based on API STD 1104-2005 and CSA Z662-2007, field girth welding tests and girth weldability evaluations were executed for three types of wall thickness X70 UOE pipeline, in which the most popular main line girth welding method, single-wire automatic gas metal arc welding （GMAW）, was used. The welding procedure specification was optimized to achieve a good quality and cold-crack-free girth weld joint without preheating or post-weld heat treatment. In addition ,porosities ,inclusions ,and incomplete fusion defects were avoided. The tensile strength,bending ,Vickers hardness,Charpy V-notch impact toughness, and crack tip opening displacement fracture toughness of the girth weld joint were evaluated, and the field girth weldability of Baosteel＇ s X70 UOE pipeline is joint exhibited good mechanical performance. Thus, the excellent for automatic GMAW.展开更多
文摘Based on the offshore standard DNV-OS-F101-2010,girth welding tests and girth weldability evaluations were carried out for the X65 and X70 UOE submarine pipelines of 3 wall thickness gauges,in which semi-automatic gas metal arc welding （GMAW） was adopted matched with metal powder flux cored wire. The girth welding procedure specification （WPS） was optimized to obtain good quality and cold-crack-free girth weld joint without preheating and post-weld heat treatment. At the same time, porosities, inclusions and incomplete fusion defects were avoided. Girth weld joints were evaluated for tensile strength, bending, Vickers hardness, charpy impact toughness and crack tip opening displacement （CTOD） fracture toughness. Results show that all the girth weld joints have good mechanical performances,indicating that the irth weldabilitv of Baosteel＇ s UOE submarine pipelines is excellent in the case of semi-automatic GMAW.
文摘Based on API STD 1104-2005 and CSA Z662-2007, field girth welding tests and girth weldability evaluations were executed for three types of wall thickness X70 UOE pipeline, in which the most popular main line girth welding method, single-wire automatic gas metal arc welding （GMAW）, was used. The welding procedure specification was optimized to achieve a good quality and cold-crack-free girth weld joint without preheating or post-weld heat treatment. In addition ,porosities ,inclusions ,and incomplete fusion defects were avoided. The tensile strength,bending ,Vickers hardness,Charpy V-notch impact toughness, and crack tip opening displacement fracture toughness of the girth weld joint were evaluated, and the field girth weldability of Baosteel＇ s X70 UOE pipeline is joint exhibited good mechanical performance. Thus, the excellent for automatic GMAW.
