摘要
结合国产 1 6Mn低合金中强钢 ,进行了使用超声冲击法提高含咬边缺陷的十字型焊接接头疲劳强度、延长其疲劳寿命的研究。结果表明 :咬边等焊接缺陷降低焊接接头疲劳强度 (与不含明显上述缺陷的试件相比 )约 1 0 %～ 2 0 %左右 ;超声冲击处理后 ,含咬边缺陷的 (焊趾处 ) 1 6Mn钢十字接头的疲劳强度提高 66% ,疲劳寿命提高 1 0～ 4 0倍 ;与不含焊接缺陷的焊态试件相比 ,提高疲劳强度 32 % ,提高疲劳寿命 2～ 7倍 ;咬边缺陷对冲击处理后焊接接头的疲劳性能仍有不利的影响。
Some weld defects, such as undercuts, often exist in the surface at the weld toe. These defects greatly affect the capability of the weld subjected to dynamic loading and fatigue cracks usually initiate from these zones with defects. At present, no method using ultrasonic peening technique to treat weld structure with defects and to improve fatigue strength has ever been reported yet at home. Combining with low-alloy middle strength steel 16 Mn, a study of increasing the fatigue strength and raising fatigue life was carried out. Compared with specimens without defects, the fatigue strength of specimens with undercuts has been increased by 10%-20%. It also shows that with ultrasonic peening treatment, the fatigue strength of the cruciform weld joint of steel 16 Mn has been increased by 66%, and the fatigue life by 10-40 times. Compared with as-welded specimens with no defects, the fatigue strength has been increased by 32%, and the fatigue life by 2-7 times. Undercuts have adverse effects on fatigue property of weld joints under peening conditions.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2001年第3期231-234,共4页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金资助项目! (5 95 75 0 6 1)
关键词
疲劳强度
咬边
焊接接头
超声冲击
焊趾
焊接缺陷
Cracks
Fatigue of materials
Strength of materials
Ultrasonic applications
