The specimens of the welded joints were treated with ultrasonic impact treatment ( UIT) and compared with the as-welded ones. 采用超声冲击处理(UIT)方法对焊接接头进行处理,并将冲击态接头与焊态接头进行了对比。
Compared with as-welded specimens with no defects, the fatigue strength has been increased by32%, and the fatigue life by2~ 7 times. 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;
It is shown that the as-welded joint microstructure was composed of a small amount of retained β/ B2 phases and β-transformed microstructures including secondary α_2, some Ο phase and ω phase. 结果表明,焊态下焊缝组织为残留β/B2相和包括次生α2相、O相以及ω相在内的β转变组织;
The results shown there were fiber zone, partially recrystallized zone, fine grain zone, coarse grain zone and unequilibrium microstructure zone in the as-welded joint. 结果表明,接头焊态组织可分母材纤维组织区、部分再结晶区、细晶区、粗晶区及熔核中的非平衡组织区;
The results show that the weldments made from those metals in as-welded condition are instable in dimension and the rate of dimensional change decreases with time. 结果表明:七种材料的焊件都存在着尺寸不稳定,这种尺寸不稳定变形随时间的变化速率逐渐变缓;
The results show that the fatigue life of the peened joint is 20~ 30 times as long as the as-welded joints. Therefore, the improvement of the fatigue strength of welded joints by ultrasonic peening is remarkable. 试验结果表明:超声冲击方法对焊接接头疲劳强度的改善效果十分明显,能够提高疲劳寿命20~30倍以上,极具实用价值。
Inquiry about material selection and as-welded technical specification of 8 000m~ 3 spherical tank 8000m~3球罐选材及焊态使用技术要求探讨
It was found that the X-Ray measuring technique of residual stresses used for the large spherical vesseles in the working field is feasible, the measured residual stresses in the as-welded state were higher and they were sufficiently relieved after postweld heat treatment. 测试结果表明,X射线应力测试技术用于大型球罐残余应力的现场测量是可行的;在焊态下测量的残余应力值较高,而焊后热处理使残余应力得到充分的解放。
By adopting optical metallography, micro-hardness examination etc., the comparative test to the microstructure of the dissimilar steel tube joint ( 12Cr1MoV and 0Cr17Ni12Mo2) with Ni-based weld between in as-welded condition and after the high temperature run was carried out. 采用光学金相、显微硬度等试验方法,对12Cr1MoV和0Cr17Ni12Mo2两种管材的镍基焊缝异种钢接头显微组织,进行焊后状态和高温运行后状态对比分析试验。
The material selection of shell of the 8 000 m3 spherical tank in accordance with design parameter and condition of service is analysed and demonstrated. Working specification for manufacture, assembly and field weld to be strictly controlled is put forward to ensure safety using as-welded. 针对8000m3球罐的设计参数及使用条件,对球壳材质选用进行了分析和论证,并提出了必须严格控制的制造和组焊技术要求,以确保球罐在焊态下安全运行。