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                                        | 摘要: |  
                                        | 下向焊是一项新工艺,初次应用的结果表明,它确有许多优越性,很值得推广使用。 |  
                                        | Downward welding is a new technology. The initial practical results show that it has many advantages and isworth extending and applying. |  
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                                        | 参考文献: |  
                                        | 1宁孝文.管道下向焊的操作要领.《焊接》,1991(5)
2范作志:φ529×5mm气管线下向焊焊接工艺.《焊接》1994(4)
3  John P. Stewart:The welder’s Handbook Printed in theUnited States of America.1981
4 Cambridge University Press.The science and Practice ofwelding.1984 |  
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