PSI - Issue 22

Xiaoteng Wang et al. / Procedia Structural Integrity 22 (2019) 59–63 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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minimum fatigue life of sample H-3, which is 223.2 thousand. That is to say, all of the fatigue life values with HPAW are longer than those of GMAW. According to the reference [2], it can be obtained that in the 95% confidence interval, the fatigue life of welding joints with HPAW increased from 30.28% to 93.78% than those of GMAW.

(b)

(a)

Fig. 2. The cross section of welding seam with (a) GMAW and (b) HPAW

(a1)

(a2)

(b2)

(b1)

Fig. 3. The fatigue facture surface of welding joints with (a) GMAW and (b) HPAW

Figure2 shows the macroscopic morphology of welding joints with both of welding methods. It can be seen from figure2 that reinforcement including the top and bottom surface of the welding joint with GMAW is higher than those of HPAW. And compared with the welding joint with GMAW, the welding toe of top and bottom surface is smoother. Besides, it has been found in experiments that the fatigue crack occurs at the welding toe of bottom