WELDINGHAYNES® HR-120® alloy is readily weldable by Gas Tungsten Arc (TIG), Gas Metal Arc (MIG), and Shielded Metal Arc (SMAW) welding processes.  Many of the alloy’s welding characteristics are similar to those for the HASTELLOY alloys and the same precautions apply.  Submerged Arc Welding is not recommended as this process is characterized by high heat input which could result in distortion and hot cracking.  Any start/stop cracking should be removed by grinding prior to further welding.  Do not attempt to remelt or “wash-out” welding cracks. 

Base Metal Preparation  The joint surface and adjacent area should be thoroughly cleaned before welding.  All grease, oil, crayon marks, sulfur compounds and other foreign matter should be removed.  It is preferable, but not mandatory that the alloy be in the solution-annealed condition when welded. 

Filler Metal Selection  HAYNES 556TM filler metal and MULTIMET® 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. 

Preheating, Interpass Temperatures and Post-Weld Heat Treatment  Preheat should not be used so long as the base metal to be welded is above 32°F (0°C).  Interpass temperatures should be less than 200°F (95°C).  Auxiliary cooling methods may be used between weld passes, as needed, providing that such methods do not introduce contaminants.  Post-weld heat treatment is not normally required for HR-120 alloy. 

Nominal Welding Parameters  Nominal welding parameters are provided as a guide for performing typical operations.  These are based on welding conditions used in our laboratory and should be considered only as a guideline.  Shielded Metal Arc Welding

ElectrodeDiameter, in. (mm)

ArcVoltage, volts

WeldingCurrent, amps

3/32 (2.4)1/8 (3.2)5/32 (4.0)3/16 (4.8)

22-2422-2422-2524-26

55-7580-100125-150150-180

 Gas Tungsten Arc Welding

JointThickness,

in.                     (mm)Tungsten Electrode* Diameter,

in.                     (mm)Filler Wire 

Diameter, in.Welding

Current, amps Arc Voltage, volts1/32-1/161/16-1/81/8-1/4

>1/4

(0.8-1.6)(1.6-3.2)(3.2-6.4)

(6.4)

1/161/16 or 3/32

3/32-1/83/32-1/8

(1.6)(1.6 or 2.4)(2.4 or 3.2)(2.4 or 3.2)

1/161/16 or 3/323/32 or 1/83/32 or 1/8

15-6050-9575-13095-150

9-129-1210-1310-13

*2% Thoriated tungsten  Shielding gas 100% Argon, flow rate~25 ft3/hr (12 L/min)

 

Gas Metal Arc Welding

  Wire Diameter,in. (mm)

Shielding*Gas

WeldingCurrent, amps Arc Voltage, volts Travel Speed

in. (mm)/min.

Short  Circuitng  Transfer

0.035 (0.9)0.045 (1.1)

75%Ar-25%He75%Ar-25%He

70-90100-150

18-2019-22

8-10 (200-250)8-10 (200-250)

*Flow Rate~35 cu. ft./hr. (16 L/min)  POLARITY:  SMAW and GMAW-DCRP-Electrode Positive                      GTAW DCSP-Electrode Negative

 

Tensile Properties of 556 Weld Metal (GMAW)

Test Temperature

UltimateTensile

StrengthYield Strengthat 0.2% Offset

Elongationin 2 in. (50.8mm)

°F °C Ksi MPa Ksi Mpa %

Room1200140016001800

Room650760870980

115.481.066.340.224.0

795560455270165

77.253.349.536.823.6

530380340255165

3739263430

 Tensile Properties of 556 Weld Metal (GMAW) vs. HR-120 Plate

 

Restrained 1/2 inch thick HR-120® plates have been successfully joined using 556TM 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

WeldingProduct

HotCracking

2T Radius GuidedBend Test

Face             Side

GTAW  GMAW  SMAW

556 Filler Metal556 Filler Metal

MULTIMET Electrodes

NoneNoneNone

Pass            PassPass            PassPass            Pass

 Room Temperature Tensile Strength of Transverse Welded Specimens

Welding  Process

WeldingProduct

Tensile StrengthKsi     MPa Fracture Location

GTAW  GMAW  SMAW

556 Filler Metal556 Filler Metal

MULTIMET Electrodes

111.0     765109.4     755109.7     755

HR-120 Base MetalHR-120 Base MetalHR-120 Base Metal

 HAYNES ® HR-120 ® alloy   Principal Features  Mechanical Properties Thermal Stability  Environmental Resistance  Typical Physical Properties

Welding Machining and Grinding Applications Comparative Data Availability Acknowledgments

Health and Safety  HR-120 ® alloy Trademark Applicable Specifications Fabrication Guidelines Request for Literature