Transactions on Intelligent Welding Manufacturing by Shanben Chen Yuming Zhang & Zhili Feng

Author:Shanben Chen, Yuming Zhang & Zhili Feng
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

Fig. 6.Transverse of welding seams at different bypass currents

Table 1.The measurement of weld size and welding dilution rate

Bypass current/A

Weld width/mm

Weld reinforcement/mm

Weld depth/mm

Dilution rate/%

0

7.29

2.52

2.36

35

10

6.78

2.66

1.40

27

12

6.375

2.85

1.12

23

14

6.325

2.53

1.10

22

To further verify the use of bypass coupling micro plasma welding method whether can diminish the heat input of base metal, the thermal cycling curve was test during the welding process. The thermal cycling curves were shown in Fig. 7. From Fig. 7, the peak temperatures of each test point under different bypass currents were obtained. Figure 8 is the peak temperature of thermal cycling curves under different bypass currents. In the three thermal cycle curves, the peak temperature of point A at 0 A bypass current is the highest, reaching 538.5 °C. As the bypass current Ib increases from 10 A to 12 A, 14 A, the peak value of the temperature is reduced to 504 °C, 442.9 °C, 401.1 °C. The peak temperature of point B and point C also meet this trend. It can be proved that the heat input to base metal is decreasing constantly with the increase of bypass current.

Fig. 7.The thermal cycling curves at different bypass current

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