INVESTIGATION OF WELDABILITY OF HOT-WORK TOOL STEELS

Abstract

The weldability of 6 hot-work tool steels was investigated to develop optimum welding procedures. Welds were made in sheet and plate with the inert- gas tungsten-arc and inert-gas consumable electr de processes under various welding conditions. Variations in preheat, postheat, and energy input had statistically significant, but practically unimportant, effects on mechanical properties after hardening and tempering. Most mechanical-test failures were initiated in the welds whether or not defects were present. The weld metal retained its heterogeneous microstructure after hardening and tempering even when previously subject to annealing-type heat treatments. Lehigh-restrainttest s udies indicated that hot and cold cracking can occur. Low-temperature cracking can be prevented by increasing the preheat temperature. Large-radius Charpy-impact specimens were found to be more satisfactory than the V-notched specimens for these steels. The high-temperature weld tensile strength at 1000 F was 190,000 psi for an H-11 steel; it was reduced to 156,000 after holding at 1000 F for 24 hours.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1961
Accession Number
AD0273867

Entities

People

  • J. G. Maciora
  • N. A. Sinclair
  • R. P. Sopher

Organizations

  • General Dynamics Electric Boat

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Bending Stress
  • Elastic Properties
  • Gas Tungsten Arc Welding
  • Geometry
  • Materials
  • Measurement
  • Mechanical Working
  • Mechanics
  • Modulus Of Elasticity
  • Notch Sensitivity
  • Statistical Analysis
  • Stress Strain Relations
  • Tensile Properties
  • Tensile Strength
  • Test And Evaluation
  • Transition Temperature

Fields of Study

  • Materials science

Readers

  • Metallurgy