Accession Number:

AD0649137

Title:

A STUDY OF HOT CRACKING IN WELDED HIGH-STRENGTH STEELS USING THE VARESTRAINT TEST.

Descriptive Note:

Research and development phase rept.,

Corporate Author:

NAVY MARINE ENGINEERING LAB ANNAPOLIS MD

Personal Author(s):

Report Date:

1967-03-01

Pagination or Media Count:

49.0

Abstract:

Hot cracking of HY-130150 steel and a rare-earth-treated HY-80 steel during welding was investigated with the Varestraint test apparatus, a device which permits independent variation of welding conditions and restraint. The test involves depositing a weld bead and simultaneously applying an instantaneous bending load. The susceptibility of a material to hot cracking is determined from the resulting amount of cracking. Two welding processes were used on thin plate specimens tungsten-inert-gas without filler, and metal-inert-gas. Results showed that the amount of hot cracking varied with welding conditions, plate thickness, and applied strain. The data indicated HY-130150 to be more resistant to cracking than HY-80. Cracking occurred at solute-enriched grain boundaries, but not at substructure boundaries. Segregation and structural features of boundaries were found to be important factors associated with hot cracking. Examination of the metal-inert-gas welds revealed evidence of capillary diffusion of solute into hot cracks.

Subject Categories:

  • Properties of Metals and Alloys
  • Fabrication Metallurgy
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE