溶融亜鉛めっき槽用鋼板溶接継手部の強度・信頼性(その3) : 溶接部の溶融亜鉛中クリープ破断強度特性

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In this study, the creep rupture tests in liquid zinc and in air of deposited metals at the temperatures of 430, 450 and 480℃ were carried out to obtain the guideline which selects optimum welding consumables for the production of a hot dip galvanizing bath in terms of the creep rupture strength. The base metal used was a carbon steel specialized for a galvanizing bath. The multi pass deposited metals in which Si content mainly varied were produced using various welding processes such as a shielded metal arc, a gas shielded arc and a submerged arc weldings. Main conclusions obtained were as follows. (1) The creep rupture strength of the base metal in liquid zinc was lower than that in air. The creep rupture strength of various deposited metal in liquid zinc was almost equal to that of the base metal. (2) The values of the elongation and the reduction of area of the creep tested specimen in liquid zinc decreased with an increase in Si content. (3) Judging from the properties of deposited metal such as the elevated temperature strength, the creep rupture strength, the susceptibility of liquid metal embrittlement and the characteristic of corrosion in liquid zinc, the deposited metal with low Si content produced by MAG welding has the best performance. Therefore, MAG welding process might be substituted for SMAW process in order to construct a hot dip galvanizing bath. Moreover, as the performance of SAW deposited metal with low Si content was almost equivalent to that of the base metal, SAW process was applicable to construct a hot dip galvanizing bath when the welding procedure was limited.
社団法人日本船舶海洋工学会の論文
2000-03-29

溶融亜鉛めっき槽用鋼板溶接継手部の強度・信頼性(その3) : 溶接部の溶融亜鉛中クリープ破断強度特性

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