钢板焊接工艺设计说明书.pdfVIP

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20钢板焊接工艺设计说明书

目录

摘要······························11母材的基本数据与焊接

性····················11.1母材的基本数

据·······················1

1.1.120钢的介绍·······················1

1.1.3碳钢的化学成分······················1

1.1.420钢的化学成分与基本力学性能···············2

1.2.20钢的焊接性·······················2

1.2.1碳当量分析·······················2

1.2.2焊接性分析·······················3

1.2.3焊接时存在的问题·····················32焊接方法的选

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························43焊接工艺···························5

3.1焊前准备·························5

3.1.1坡口设计·······················5

3.1.2坡口加工方法与清理··················5

3.1.3焊件装配·······················5

3.1.4焊前预热、层间温度以及焊后热处理············6

3.2焊接参数的选择·······················6

3.2.1焊丝直径的选择·····················6

3.2.2焊接电流的选择·····················7

3.2.3电弧电压的选择·····················7

3.2.4焊接速度的选择·····················8

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3.2.5焊丝伸出长度的选择···················8

3.2.6电流极性的选择·····················8

3.2.7焊接回路电感值的选择··················8

3.2.8气体流量的选择·····················9

4.焊接设备···························9

5.焊接材料··························101

5.1CO2气体·························10

5.2焊丝··························11

5.2.1焊丝的选择······················11

5.2.2焊丝的质量······················116焊接实施方法及步

骤·····················11

6.1引弧

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···························11

6.2焊接··························12

6.3收弧··························127施焊时注意事

项·······················128.CO2焊常见缺陷、产生原因及特征与

预防措施··········129焊后检测····················

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