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

Item

Title
High Deposition Rate Gas Tungsten Arc (Tig) Welding Of High Strength Steels
Date
1968
Index Abstract
Not Available
Photo Quality
Complete
Report Number
AFML TR 68-123
Corporate Author
Union Carbide Corp Newark Nj Linde Div
Laboratory
Air Force Materials Laboratory
Extent
166
NTRL Accession Number
AD835225
Identifier
AD0835225
Access Rights
Export Controls
Distribution Classification
1
Contract
AF 33(615)-2714
DoD Project
8-314
DTIC Record Exists
No
Distribution Change Authority Correspondence
USAFSC LTR
Distribution Conflict
No
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.
Report Availability
Full text available
Date Issued
1968-05
Provenance
Lockheed Martin Missiles & Fire Control
Type
report
Format
1 online resource
Creator
Miller, Howard R.
Media
AFMLTR68-123.pdf