P-TIG横焊根部焊道单面焊双面成形影响因素
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摘要
TIG横焊打底焊作为大型汽轮机焊接转子关键制造技术之一,国外有关公司将其作为Know-How进行严格的技术封锁.文中开展了焊接工艺参数(电弧电压、焊接电流、脉冲频率和送丝速度)对P-TIG横焊单面焊双面成形影响的试验研究.结果表明,焊接电流对根部焊道单面焊双面成形的熔透性起着决定性的作用,其次是电弧电压;脉冲频率对正面焊缝成形的影响较大,而且对于抑制熔池金属的下淌倾向具有良好的效果;送丝速度和电弧电压对背面焊缝成形影响较大,当焊接工艺参数较小时,背面焊缝不能够成形.
TIG back welding in position welding is one of the key manufacturing technology for large rotor in steam turbine.The foreign companies consider it as Know-How and blockade it strictly. In this thesis,carries out welding parameters as arc voltage,welding current,pulse frequency and wire feed speed,and that effects on one-side welding with back free formation of horizontal pulse TIG. The results showed that,the welding current has a vital important influence on penetration resistance of one-side welding with back free formation and followed by arc voltage; pulse frequency for positive impact is relatively large,and can effectively inhibit the tendency to drip; wire feed speed and arc voltage can play an important role in the back weld forming,when the welding parameters is small,the back weld can not be forming.
TIG back welding in position welding is one of the key manufacturing technology for large rotor in steam turbine.The foreign companies consider it as Know-How and blockade it strictly. In this thesis,carries out welding parameters as arc voltage,welding current,pulse frequency and wire feed speed,and that effects on one-side welding with back free formation of horizontal pulse TIG. The results showed that,the welding current has a vital important influence on penetration resistance of one-side welding with back free formation and followed by arc voltage; pulse frequency for positive impact is relatively large,and can effectively inhibit the tendency to drip; wire feed speed and arc voltage can play an important role in the back weld forming,when the welding parameters is small,the back weld can not be forming.
引文
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[3]荆学东,尚久浩,侯高强,等.TIG焊接中单面焊双面成型的研究[J].西北轻工业学院学报,2000,3(18):66-69.Jin Xuedong,Shang Jiuhao,Hou Gaoqiang,et al.Research of one-side welding with back free formation for TIG welding[J].Journal of Northwest University of Light Industry,2000,3(18):66-69.
[4]吴敏,杜学铭.MAG焊单面焊双面成形影响因素分析[J].中国水运,2009,5(9):113-115.Wu Min,Du Xueming.Influencing factors of one-side welding with back free formation for MAG welding[J].China Water Transport,2009,5(9):113-115.
[5]中国机械工程学会焊接学会.焊接手册—材料的焊接(2)[M].北京:机械工业出版社,2008.
[2]沈红卫,王思玉,刘霞.新焊接转子材料25Cr2Ni2Mo V钢的试制及其性能试验[J].热力透平,2008,3(37):149-152.Shen Hongwei,Wang Siyu,Liu Xia.Development and performance test of new rotor material 25Cr2Ni2Mo V[J].Thermal Turbine,2008,3(37):149-152.
[3]荆学东,尚久浩,侯高强,等.TIG焊接中单面焊双面成型的研究[J].西北轻工业学院学报,2000,3(18):66-69.Jin Xuedong,Shang Jiuhao,Hou Gaoqiang,et al.Research of one-side welding with back free formation for TIG welding[J].Journal of Northwest University of Light Industry,2000,3(18):66-69.
[4]吴敏,杜学铭.MAG焊单面焊双面成形影响因素分析[J].中国水运,2009,5(9):113-115.Wu Min,Du Xueming.Influencing factors of one-side welding with back free formation for MAG welding[J].China Water Transport,2009,5(9):113-115.
[5]中国机械工程学会焊接学会.焊接手册—材料的焊接(2)[M].北京:机械工业出版社,2008.