1. Introduction
2. Experiment Set-up and Numerical Analysis
2.1 Experimental Procedure
Table 1
Chemical compositions (wt.%) | |||||||||
---|---|---|---|---|---|---|---|---|---|
C | Mn | Si | P | S | Cr | Ni | N | ||
0.08 | 2.0 | 0.75 | 0.045 | 0.030 | 20.0 | 10.5 | 0.10 | ||
Mechanical properties | |||||||||
Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | |||||||
515 | 210 | 40 |
Table 2
2.2 Finite Element Model
2.3 Heat Source and Heat Sink Model
3. Analysis Results and Discussion
3.1 Temperature Distribution Characteristics
Fig. 6

Fig. 8

3.2 Deformation Distribution Characteristics
Fig. 10

Fig. 11

Fig. 12

Fig. 13

4. Conclusion
1) From the thermal conduction analysis results, it was confirmed that the temperature in cooling stage of weld metal, heat-affected zone, and base metal were decreased by 192.4 K, 179.9 K, and 140.1 K in the heat sink welding with standoff distance of 40 mm compared to conventional welding.
2) From the thermal elastic-plastic analysis results, it was confirmed that the longitudinal deformation and angular deformation were approximately reduced by 60% and 70% in the heat sink welding with standoff distance of 40 mm compared to conventional welding.
3) From the above results, it could be inferred that the cooling effect was increased as the standoff distance became shorter, the intensity of cooling effect contributed to reduce of welding deformation.