| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.19 ( November 1988 ) Steel Pipe ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Newly Developed Electrode KS-1000 for Repair
Welding under Varying Stress Kohki Satoh, Yutaka Kawai, Tadamasa Yamaguchi, Noboru Nishiyama, Yasumasa Nakanishi, Yoshitaka Nakamura |
| Synopsis: New covered electrodes KS-1000 suited to repair welding of such structures as bridges and highways etc. under pulsating stress (varying stress) in service conditions have been developed by examing the effect of chemical compositions on hot crack sensitivity of the metal welded under pulsating stress. KS-1000 electrodes have excellent anti-cracking characteristics, and the critical root gap opening displacement range for cracking of the newly-developed electrodes under pulsating stress is much larger than that of conventional electrodes. Though KS-1000 has only a strength level of 490 MPa, it is possible to apply it to 590-MPa class high tensile strength steel by using it for the root pass, where hot cracks in weld metal were mainly observed, and to apply conventional electrodes to the remaining passes. KS-1000 electrodes are suited not only to repair welding of the structure under pulsating stress but also to tack welding and restraint welding for jigs. |
| TextiPDF: 5P/204kbj |