Contrails
The goal of the Contrails project is to help preserve and disseminate the technical record of 20th century aerospace research, highlighting in particular the research endeavors of the Illinois Tech community.

High Deposition Rate Gas Tungsten Arc (Tig) Welding Of High Strength Steels

Report Number: AFML TR 68-123
Author: Miller, Howard R.
Corporate Author: Union Carbide Corp Newark Nj Linde Div
Laboratory: Air Force Materials Laboratory
Date of Publication: 1968-05
Pages: 166
Contract: AF 33(615)-2714
Project: 8-314
AD Number: AD0835225

Abstract:
Reliable procedures were established for high deposition Tig welding of three high strength steels. However, the selection of welding procedures is a function of the metallurgical behavior of each weld metal. Because a postweld quench and temper heat treatment homogenizes most structural variations, the properties of welds made in D-6ac are virtually independent of welding parameters. Although the postweld maraging heat treatment of welds made in 18 Ni (VAR) steel makes the tensile properties independent of welding procedures, the fracture toughness of such welds can vary. Toughness is a function of the amount of grain refinement and thermal cycling achieved in multipass welds. By balancing filler deposition rates and welding heat input, pass size can be adjusted so fracture toughness of welds will be equivalent or superior to conventional Tig welds. The as-welded tensile and impact properties of welds made in HP 9 Ni-4 Co-.20 C steel are very sensitive to welding conditions. Grain refinement and self-tempering must be maximized; yet the amount of ferrite in the microstructure must be minimized. Despite these restraints, high deposition welding procedures will develop weld metal properties equivalent to Tig welding. The high deposition rate Tig-hot wire process should offer significant cost savings to aerospace fabricators.


Provenance:
Lockheed Martin Missiles & Fire Control
Download this report

(PDF, 6.31 MB, 166 pages)

Other options for obtaining this report

Via the Defense Technical Information Center (DTIC):
A record for this report, and possibly a full-image download of the report, exists at DTIC

Via National Technical Information Service:
The NTIS Order Number for this report is: AD835225
This report may have been digitized and made freely available for public download, or made publicly available for purchase by the National Technical Information Service through their online database, the National Technical Reports Library

Indications of Public Availability
No digital image of an index entry indicating public availability is currently available
There has been no verification of an indication of public availability from an inside cover statement