鋳鉄のエレクトロスラグ溶接(第 3 報) : 変態とその超塑性を利用した溶接割れ防止に関する一考察

概要

論文の詳細を見る
As described in the last reports, it was shown that a vertical butt welding of thick cast iron plates by electloslag process was succeeded using our new method with a cored wire and a hollow graphite nozzle. However, it is necessary to more improve the crack resistance of weld metals to apply to higher restraint welds, such as a repair welding of large hollow defects in a heavy cast frame of a machine tool. The present paper shows that the application of the transformation superplasticity by retarding martensite transformation is more effective for a prevension of weld metal cracking due to high thermal stress. A dilatation test and a restraint test under synthetic weld thermal cycles, determination of CCT diagrams, and hardness measurements are conducted on many cast iron specimens with various alloying elements. As these results, it is known that the weld metal compositions of cast iron in a range of 0.1∿1% Mo and 0.5∿3 Ni are suitable to prevent weld cracking due to high restraint.
社団法人溶接学会の論文
1974-08-05