HAYNES® HR-120® alloy Site
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HAYNES® HR-120® alloy
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HAYNES® HR-120 ® alloy
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Welding |
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HAYNES® 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 deg. F (0 deg. C).
Interpass temperatures should be less than 200 deg. F (95 deg. 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
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Electrode
Diameter, in. (mm) |
Arc
Voltage, volts |
Welding
Current, amps |
3/32 |
(2.4) |
22-24 |
55-75 |
1/8 |
(3.2) |
22-24 |
80-100 |
5/32 |
(4.0) |
22-25 |
125-150 |
3/16 |
(4.8) |
24-26 |
150-180 |
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| Gas Tungsten Arc Welding |
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Welding |
Arc |
Joint
Thickness, in. (mm) |
Tungsten Electrode*
Diameter, in. (mm) |
Filler Wire
Diameter, in. |
Current, amps |
Voltage, volts |
1/32-1/16 |
(0.8-1.6) |
1/16 (1.6) |
1/16 |
15-60 |
9-12 |
16/-1/8 |
(1.6-3.2) |
1/16 or 3/32 (1.6 or 2.4) |
1/16 or 3/32 |
50-95 |
9-12 |
1/8-1/4 |
(3.2-6.4) |
3/32 or 1/8 (2.4 or 3.2) |
3/32 or 1/8 |
75-130 |
10-13 |
>1/4 |
(6.4) |
3/32 or 1/8 (2.4 or 3.2) |
3/32 or 1/8 |
95-150 |
10-13 |
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*2% Thoriated tungsten
Shielding gas 100% Argon, flow rate~25 ft3/hr (12 L/min) |
| Gas Metal Arc Welding |
Wire |
Shielding* |
Welding |
Arc |
Travel Speed |
Diameter, in. (mm) |
Gas |
Current, amps |
Voltage, volts |
in. (mm)/min |
Short Circuiting Transfer |
0.035 |
(0.9) |
75%Ar-25%He |
70-90 |
18-20 |
8-10 (200-250) |
0.045 |
(1.1) |
75%Ar-25%He |
100-150 |
19-22 |
8-10 (200-250) |
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*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 |
Ultimate Tensile Strength |
Yield Strength
at 0.2% Offset |
Elongation in 2 in. (50.8mm) |
°F |
°C |
Ksi |
MPa |
Ksi |
MPa |
% |
Room |
Room |
115.4 |
795 |
77.2 |
530 |
37 |
1200 |
650 |
81.0 |
560 |
53.3 |
380 |
39 |
1400 |
760 |
66.3 |
455 |
49.5 |
340 |
26 |
1600 |
870 |
40.2 |
270 |
36.8 |
255 |
34 |
1800 |
980 |
24.0 |
165 |
23.6 |
165 |
30 |
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| Tensile Properties of 556 Weld Metal (GMAW) vs. HR-120 Plate |
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| 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. |
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2T Radius Guided |
Welding |
Welding |
Hot |
Bend Test |
Process |
Product |
Cracking |
Face Side |
GTAW |
556 Filler Metal |
None |
Pass |
Pass |
GMAW |
556 Filler Metal |
None |
Pass |
Pass |
SMAW |
MULTIMET Electrodes |
None |
Pass |
Pass |
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Room Temperature Tensile Strength of Transverse Welded Specimens |
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Tensile Strength |
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Welding Process |
Welding Product |
Ksi |
MPa |
Fracture Location |
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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| Health and Safety |
Nickel-, cobalt-, and iron-base alloys may contain, in varying concentrations, the following elemental
constituents: aluminum, cobalt, chromium, copper, iron, manganese, molybdenum, nickel, and tungsten.
For specific concentrations of these and other elements present in any particular product, refer to
the Material Safety Data Sheets (MSDS) available from Haynes.
Inhalation of metal dust or fumes generated from welding, cutting, grinding, melting, or dross handling of
these alloys may cause adverse health effects such as reduced lung function or nasal and mucus
membrane irritation. Exposure to dust or fumes, which may be generated by working these alloys, may
also cause eye irritation, skin rash and effects on other organ systems.
The operation and maintenance of welding and cutting equipment should conform to the provisions of
American National Standard ANSI Z49.1-88, “Safety In Welding and Cutting”. Attention is especially
called to Sections 4 (Protection of Personnel) and 5 (Ventilation) of ANSI Z49.1. Mechanical ventilation is
advisable and, under certain conditions such as a very confined space, is necessary during welding or
cutting operations to reduce exposure to hazardous fumes, gases, or dust. |
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