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A Comparative Study on the Characteristics of STS 304, Inconel 625 Laser and Arc Welded Bead (BOP)

Fig. 25 Hybrid Weldhead Configuration Schematic

Fig. 26 Inconel 625 and STS 304 Laser Welding BOP Test Results

Fig. 27 Inconel 625 and STS 304 Arc Welding BOP Test Results

Material Side section of bead External appearance
STS 304
INCONEL 625

STS 304 - SS 400 Overlapping Hybrid Welding Experiment

Fig. 28 STS 304 - SS 400 Overlapping Weld Schematic

STS 304-SS 400 Overlapping Welding Orthogonal Arrangement Method

Case No. Laser Output (kW) Transfer speed (m/min) Wire Transmission Speed (m/min)
1 2.7 0.4 4.8
2 2.7 0.7 5.3
3 2.7 1 5.8
4 3 0.4 5.3
5 3 0.7 5.8
6 3 1 4.8
7 3.3 0.4 5.8
8 3.3 0.7 4.8
9 3.3 1 5.3
*Fixed variables: Protective gas type, protected gas flow rate, laser lead, laser-arc heat source gap, torch angle, wire type, laser focus position, etc.

STS 304 - SS 400 Hybrid Overlay Welding Test Results

Case No. Bead surface Side section of bead Tensile strength (MPa)
1 Weld Defect
2 525.2
3 573
4 510.6
5 439
6 396.9
7 560
8 548.7
9 458.7

Fig. 29 Results of tensile strength test for each condition

Fig. 30 Noise ratio analysis versus signal

Fig. 31 Bid Surface and Section Shape in Tension Strength Steel Conditions