CRACKING BEHAVIOR OF MULTIPASS FILLET WELD IN HY 80 TYPE HT70 STEELS

Cruciform-shaped and tee-shaped weld cracking tests were performed to make clear the effects of different conditions on the cracking behavior of multipass fillet weld in eight of HY 80 type HT70 steels developed in Japan. In the cruciform-shaped weld cracking test under severe welding conditions, a few test steels developed various welding cracks including a crack in the heat-affected zone originating from the weld root, which has seemingly been caused by hydrogen. These cracks could be prevented by application of a high preheat and interpass temperature and adoption of a fully re-dried coated electrode. In steel U38 having a particularly high carbon equivalent and great plate thickness among the test steels, even under this crack-preventive condition the heat-affected zone developed a crack originating from the weld root, which was considered a hot crack due to liquefaction of constituents on the grain boundary. In the tee-shaped weld cracking test on two test steels which was carried out under as severe welding condition as the cruciform-shaped weld cracking test, development of welding cracks with great similarity in microscopic nature was observed. It was revealed that these cracks would not occur in single-pass welding, except under severe restraint; it did occur in two or more passes and the time of crack occurrence differed depending on the welding conditions. In Japanese.

• Corporate Authors:

  Ship Research Institute, Tokyo

  38-1, 6-chome, Shinkawa, Mitaka-shi
  Tokyo,   Japan 
• Authors:
  • KOBAYASHI, T
  • Tamura, H
• Publication Date: 1971-5

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 1-16
• Serial:
  • Ship Research Institute, Report of
  • Volume: 8
  • Issue Number: 3
  • Publisher: Ship Research Institute, Tokyo

Subject/Index Terms

• TRT Terms: Butt welds; Cracking; Heat affected zone (Metals); Weld tests
• Old TRIS Terms: Crack formation; Multipass welds
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00033661
• Record Type: Publication
• Source Agency: Ship Structure Committee
• Files: TRIS
• Created Date: Jul 28 1973 12:00AM