S-N lognormal distribution of ultra-high strength steel welding spot
WANG Xiao-guang
YU Hui-ping
LI Xiao-yang
CHEN Shu-jun
LIU Yue-hua
Abstract：In order to research the fatigue properties of ultra-high strength steel welding spot,the 22MnB5 spot-welding structure was taken as the research object.An intermediate frequency servo spot-welding device was used to weld the specimens with a thickness of 2 mm.With the high-frequency fatigue testing machine,laser repair welding device and optical microscope,the S-N curves of specimens under different welding process parameters were studied.The results show that the welding time and current parameters have obvious influence on the fatigue life of welding spot in the high stress area,while have small influence on the fatigue life of welding spot in the low stress area.In addition,the reasonable process parameters can effectively improve the fatigue life of welding spot.After the repair welding for the tiny circumferential vulnerable zone of welding spot with the laser process,the structural strength of welding spot can be effectively enhanced.
Keywords：ultra-high strength steelwelding spotlaser repair weldingstrengthgrouping methodwelding parameterfatigue lifelognormal distribution
Publication Date：2016-08-31
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 503-507 )