推荐回答(2个)
http://202.114.9.17/hjwx/w007820.pdf 焊接压力对拉伸强度的作用
有影响,而加热时间和压焊时间对拉伸强度的作
用不显著.而从表3可以看出焊接压力对冲击韧
性的作用特别显著,加热时间对冲击韧性的作用
显著,加热板温度对冲击韧性的作用有影响,而压
焊时间对冲击韧性的影响不显著.
表2 拉伸强度σs方差分析表
方差来源
变差
平均和
自由度
均方F值F0. 01F0. 05F0. 1
显著性
A2. 54021. 2704. 495. 723. 442. 5633
B2. 27621. 1383. 025. 723. 442. 563
C0. 32420. 162
D0. 08720. 044
误5. 824180. 324
误36. 235220. 283
表3 冲击韧性αk方差分析表
方差来源
变差
平均和
自由度
均方F值F0. 01F0. 05F0. 1
显著性
A4. 4322. 2263. 226. 013. 552. 623
B17. 14828. 57412. 406. 013. 552. 62333
C7. 98523. 9935. 776. 013. 552. 6233
D3. 11721. 5582. 256. 013. 552. 62
误12. 450180. 692
综合考虑上述情况,可以认为加热板温度和
焊接压力对焊接接头性能的作用特别显著,加热
时间对焊接接头性能的作用显著,压焊时间对焊
接接头性能的作用不显著.
管道焊接工艺参数:
1、焊接电源种类和极性的选择:
焊接电源种类:交流、直流;
极性选择:正接、反接;
正接:焊件接电源正极,焊条接电源负极的接线方法。
反接:焊件接电源负极,焊条接电源正极的接线方法。
极性选择原则:碱性焊条常采用直流反接,否则,电弧燃烧不稳定,飞溅严重,噪声大,酸性焊条使用直流电源时通常采用直流正接。
2、焊条直径 :
可根据焊件厚度进行选择。一般厚度越大,选用的焊条直径越粗。
3、焊接电流的选择
选择焊接电流时,要考虑的因素很多,如:焊条直径、药皮类型、工件厚度、接头类型、焊接位置、焊道层次等。但主要由焊条直径、焊接位置、焊道层次来决定。
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