摘要
对高强度低合金钢HG785D试样,采用两种不同的焊接方法进行焊接:其一是采用单一焊丝进行传统的等强度匹配焊接;其二是采用双金属复合等强度匹配焊接,即先用低强度焊丝(低于母材)焊第一层焊缝,然后用高强度焊丝(高于母材)焊第二层焊缝,依次交替,焊缝填满为止。对两种焊接工艺下的焊接接头进行疲劳性能研究,通过疲劳裂纹扩展速率测试,得到了两种焊接接头焊缝区域的疲劳裂纹扩展a-N曲线以及疲劳裂纹扩展速率da/d N-Δk曲线。分析对比其da/d N-Δk曲线可得,在同一应力水平下,传统焊接接头的疲劳裂纹扩展速率最慢,新工艺下焊接接头次之,母材的扩展速率最快。
The high strength lo w alloy steel HG785 D sample was welded with two different welding methods： one is traditional strength matching of welding with a single wire; another is a double metal composite strength matching of welding.The welding process is used in low strength wire（lower than that of he parent material） to weld the first layer of weld, and then use the high strength wire（higher than that of the base metal） to weld the second layer weld, the weld is filled alternately and the welding is over. The fatigue properties of welded joints were researched under two kinds of welding technology.Through the fatigue crack growth rate test, two kinds of welded joint region of fatigue crack propagation of a-N curve and the fatigue crack growth rate da/d N-Δk curve can be obtained.Analyzing the fatigue crack growth rate da/d N-Δk curve of the weld area of different welded joints, under the same stress level, it can be gotten that the crack propagation rate of different welded joint region is different when HG785 D steel is welded under different welding techniques. The results indicate that the traditional welded joint’ fatigue crack propagation rate is slowest, and the new technology of welded joint is second, and then the matrix metal is fastest.
出处
《热加工工艺》
CSCD
北大核心
2015年第9期31-33,共3页
Hot Working Technology
基金
中央高校基金资助项目(2013G3252006)
