Title

Investigation Of Weldability Of Hot-Work Tool Steels

Description

The weldability of six 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 electrode processes under various welding conditions.

Variations in preheat, postheat, and energy input were found to have 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-restraint-test studies 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.

Small-scale pressure vessels were tested both dynamically and statically. Sheet-bulge tests were tested dynamically. One out of four vessels, and three out of five bulge specimens failed at relatively high strengths.

Date

1961

Index Abstract

Contrails and DTIC condensed/truncated

Photo Quality

Complete

Report Number

ASD TR 61-165

Creator

Sinclair, N. A.

Maciora, J. G.

Sopher, R. P.

Corporate Author

General Dynamics Corporation Electric Boat Division

Laboratory

Directorate of Materials and Processes

Extent

138

Identifier

AD0273867

AD0273867

Access Rights

OTS

Distribution Classification

1

Contract

AF 33(616)-6519

DoD Project

7381

DoD Task

73810

DTIC Record Exists

Yes

Distribution Change Authority Correspondence

None

Date Modified

Scanned by request 2/22/2008 submitted by AIMEN Centro Tecnológico (Other Industry - International)

Report Availability

Full text available

Date Issued

1961-12

Abstract

The weldability of six 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 electrode processes under various welding conditions.

Variations in preheat, postheat, and energy input were found to have 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-restraint-test studies 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.

Small-scale pressure vessels were tested both dynamically and statically. Sheet-bulge tests were tested dynamically. One out of four vessels, and three out of five bulge specimens failed at relatively high strengths.

Publisher

Wright-Patterson Air Force Base, OH : Aeronautical Systems Division, Air Force Systems Command, United States Air Force

Distribution Conflict

No

Provenance

Lockheed Martin Missiles & Fire Control

Bombardier/Aero

Type

report

Subject

Aircraft

Welding

Tool Steel

Stresses

Guided Missiles

Microstructure

Tensile Properties

Fracture (Mechanics)

Heat Treatment

Welds

Arc Welding

Impact Shock

Sheets

Pressure Vessels

Metal Plates

Rocket Engine Cases

Hardening

Thermal Stresses

Format

1 online resource (ix, 125 pages) : ill.