溶融亜鉛めっき槽用鋼板溶接継手部の強度・信頼性(その2) : 溶接部の長期腐食特性

概要

論文の詳細を見る
In this study, the corrosion tests in liquid zinc of deposited metals throughout longest 3000 hours were carried out to obtain the guideline which selects optimum welding consumables for the production of a hot dip galvanizing bath. The corrosion test in liquid zinc was performed in a practical bath at the temperature of 450℃. 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 deposited metals were easier to be corroded by liquid zinc than HAZ. (2) The characteristic of corrosion in liquid zinc was greatly influenced by the chemical composition, especially Si content independent of welding process. Si content more than 0.20〜0.47% causes severe corrosion. (3) It was possible to adopt both submerged arc and MAG weld metals of the low Si content as welding consumables for the production of a hot dip galvanizing bath from the viewpoint of the corrosion. (4) Quantity of corrosion in long-time liquid zinc followed parabolic law.
社団法人日本船舶海洋工学会の論文
2000-03-29