Dissimilar Welding of Low Alloy Steels Welded Joints: Effect of Run-Off and Run-On Plates
Abstract
:1. Introduction
2. Materials and Test Methods
3. Results and Discussion
3.1. Microstructure and Hardness
3.2. Toughness
3.3. Component Analysis
4. Conclusions
- The metal microstructure of the cut surface was observed after the removal of the run-off plate. Only the metal microstructure of the welding wire could be observed in the weld metal, and changes in the metal microstructure caused by dissimilar welding between the base plate and run-off plate were not observed.
- Although the hardness value of the welded part was larger than that of the other parts, it was still less than 350 Hv10.
- The Charpy impact value at the end of the weld was slightly larger than the start of the weld, but it was almost the same when considering the deviation of the experiment. And it was confirmed that all of the impact results obtained were at a reference value of 27 J or higher.
- All of the components measured at the welded part coincided with the wire component. This demonstrates that components of the run-off metal are not transferred to the base metal during welding.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Specimen | Chemical Composition (mass, %) | ||||||
---|---|---|---|---|---|---|---|
C | Si | Mn | P | S | Ni | ||
Base Metal | MA-A(SS400) | 0.150 | 0.068 | - | 0.028 | 0.0144 | 0.0060 |
AH32 | 0.129 | 0.044 | 0.1286 | 0.0145 | 0.0021 | 0.0001 | |
DH36 | 0.1551 | 0.441 | 0.1483 | 0.0170 | 0.0035 | 0.187 | |
EH36 | 0.156 | 0.045 | 0.1501 | 0.0154 | 0.0031 | 0.0020 | |
Welding Consumables | AWS A.5.17 F7A8 EH14 (Φ4.0 mm) for SAW (Hyundai Weld) | 0.120 | 0.020 | 2.02 | 0.0150 | 0.003 | - |
AWS A5.29 E81T1-K2C (Φ1.2 mm) for FCAW(ESAB) | 0.030 | 0.450 | 1.28 | 0.010 | 0.008 | 1.60 |
Specimen | Mechanical Properties | ||||||
---|---|---|---|---|---|---|---|
Thickness (mm) | Yield Stress (MPa) | Tensile Strength (MPa) | Elongation (%) | V-Type Impact Test (ABS) * Mill Test Report | |||
Temp. (°C) | J | ||||||
Base Metals | MA-A(SS400) | 20 | 285 | 448 | 29 | - | - |
AH32 | 20 | 379 | 515 | 28 | −40 | ≥27 | |
DH36 | 20 | 394 | 552 | 30 | −40 | ≥27 | |
EH36 | 20 | 415 | 576 | 28 | −40 | ≥27 | |
Welding Consumables | AWS A.5.17 F7A8 EH14 (Φ4.0 mm) for SAW | - | 578 | 625 | 29 | −20 −62 * | ≥27 ≥27 * |
AWS A5.29 E81T1-K2C (Φ1.2 mm) for FCAW | - | 526 | 602 | 29 | −20 −40 * | ≥27 93 * |
Specimens | Base Metal 1 | Base Metal 2 | Run-Off Plate Metal | Quantity (Set) | Welding Procedure, Wire |
---|---|---|---|---|---|
B1 | DH36 | AH32 | A (SS400) | 6 | -SAW -WIRE + FLUX: H-14 + SF-55ULT |
B2 | DH36 | DH36 | A (SS400) | 6 | |
B3 | EH36 | AH32 | A (SS400) | 6 | |
B4 | EH36 | EH36 | A (SS400) | 6 | |
B5 | EH36 | AH32 | A (SS400) | 6 | -FCAW -WIRE: DS II-81-K2 |
Welded Joint | Welding Current (A) | Arc Voltage (V) | Travel Speed (cm/s) | Heat Input(kJ/cm) | |
---|---|---|---|---|---|
B1–4 | 1st (Face) | 850 | 32 | 32 | 51.0 |
2nd (Root) | 920 | 35 | 40 | 48.3 | |
B5 | 1st Pass | 220 | 19 | 13 | 19.3 |
2nd–5th Pass | 260 | 20 | 20 | 15.6 | |
6th Pass | 340 | 29 | 25 | 23.7 |
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Jeongung, P.; An, G. Dissimilar Welding of Low Alloy Steels Welded Joints: Effect of Run-Off and Run-On Plates. Metals 2021, 11, 642. https://doi.org/10.3390/met11040642
Jeongung P, An G. Dissimilar Welding of Low Alloy Steels Welded Joints: Effect of Run-Off and Run-On Plates. Metals. 2021; 11(4):642. https://doi.org/10.3390/met11040642
Chicago/Turabian StyleJeongung, Park, and Gyubaek An. 2021. "Dissimilar Welding of Low Alloy Steels Welded Joints: Effect of Run-Off and Run-On Plates" Metals 11, no. 4: 642. https://doi.org/10.3390/met11040642