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Welding

HAYNES® HR-120® alloy is readily welded by Gas Tungsten Arc Welding (GTAW), Gas Metal Arc Welding (GMAW), Shielded Metal Arc Welding (SMAW), and resistance welding techniques. Submerged Arc Welding (SAW) is not recommended as this process is characterized by high heat input to the base metal and slow cooling of the weld.  These factors can increase weld restraint and promote cracking.

Base Metal Preparation

The welding surface and adjacent regions should be thoroughly cleaned with an appropriate solvent prior to any welding operation.   All greases, oils, cutting oils, crayon marks, machining solutions, corrosion products, paint, scale, dye penetrant solutions, and other foreign matter should be completely removed.  It is preferable, but not necessary, that the alloy be in the solution- annealed condition when welded.

Filler Metal Selection

HAYNES® 556® filler metal (AMS 5831, AWS A5.9 ER3556) and MULTIMET® (AMS 5794) coated electrodes are recommended for joining HR-120® alloy. When dissimilar base metals are to be joined, such as HR-120® alloy to a stainless steel, HAYNES® 556® filler metal and MULTIMET® coated electrodes are again recommended. Please click here or the Haynes Welding SmartGuide for more information.

Preheating, Interpass Temperatures, and Postweld Heat Treatment

Preheat is not required. Preheat is generally specified as room temperature (typical shop conditions).   Interpass temperature should be maintained below 200°F (93°C). Auxiliary cooling methods may be used between weld passes, as needed, providing that such methods do not introduce contaminants.  Postweld heat-treatment is not generally required for HR-120® alloy.  For further information, please click here.

Nominal Welding Parameters

Details for GTAW, GMAW and SMAW welding are given here. Nominal welding parameters are provided as a guide for performing typical operations and are based upon welding conditions used in our laboratories.

Tensile Properties of All Weld Metal (AWM)

Test Temperature 0.2% Yield Strength Ultimate Tensile Strength Elongation
°F °C ksi MPa ksi MPa %
RT RT 77.2 530 115.4 795 37
1200 650 53.3 380 81.0 560 39
1400 760 49.5 340 66.3 455 26
1600 870 36.8 255 40.2 270 34
1800 980 23.6 165 24.0 165 30

RT=Room Temperature

hr120welding

Transverse Tensile Tests, HR-120® Base Metal Welded with Haynes 556® filler

Temperature 0.5 Inch Plate 0.125 Inch Sheet
UTS UTS
°F °C ksi MPa psi MPa
RT RT 106 731 104 717
200 93 97 666 97 665
300 149 91 625 92 632
400 204 87 600 89 612
500 260 86 595 78 540
600 316 85 589 83 571
700 371 84 576 79 547
800 427 84 581 83 570
900 482 82 568 82 564
1000 538 79 544 80 549
1100 593 75 516 77 530
1200 649 71 490 74 507
1300 704 68 471 66 455
1400 760 60 413 55 382
1500 816 47 327 45 312
1600 871 35 241 33 226
1700 927 27 184 26 176
1800 982 20 136 25 174
1900 1038 15 102 16 110
2000 1093 12 84 9 64

Transverse Tensile Tests, HR-120® Plate Welded with Haynes 556® filler

Temperature 1 Inch Plate 0.5 Inch Plate
UTS UTS
°F °C ksi MPa ksi MPa
RT RT 110 762 106 731
200 93 102 703 96 661
300 149 96 665 91 629
400 204 93 641 88 609
500 260 90 622 86 590
600 316 89 611 84 582
700 371 89 612 82 564
800 427 89 611 82 563
900 482 87 602 82 568
1000 538 78 538 78 534
1100 593 79 545 75 519
1200 649 75 515 72 497
1300 704 72 497 68 471
1400 760 64 439 60 412
1500 816 53 362 48 329
1600 871 40 279 36 247
1700 927 31 215 27 188
1800 982 24 166 20 141
1900 1038 18 123 15 106
2000 1093 12 84 11 74

HR-120® Plate and Transverse Weld Room Temperature Charpy Impact Tests
0.5" Plate, Welded with Haynes 556®

Condition Energy
ft-lb J
Parent Metal 182 247
GMAW SYN Mid Weld 155 211
GMAW SYN HAZ 147 199

Restrained 1/2 inch thick HR-120® plates have been successfully joined using 556® weld wire and MULTIMET® coated electrodes. The results below indicate an absence of hot cracking and microfissuring related weldability problems under the test conditions.

Welding Process Welding Product Hot Cracking 2T Radius Guided Bend Test
- - - Face Side
GTAW 556® Filler Metal None Pass Pass
GMAW 556® Filler Metal None Pass Pass
SMAW MULTIMET® Electrodes None Pass Pass

Room Temperature Tensile Strength of Transverse Welded Specimens

Welding Process Welding Product Tensile Strength Fracture Location
- - ksi MPa -
GTAW 556® Filler Metal 111.0 765 HR-120® Base Metal
GMAW 556® Filler Metal 109.4 755 HR-120® Base Metal
SMAW MULTIMET® Electrodes 109.7 755 HR-120® Base Metal
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