Study on Susceptibility and Mechanism of Reheat Cracking in Welded Joint of Type 347 Austenitic Stainless Steel

Table 5

Welding specimen M high-temperature SSRT load test result.

No.	Specimen no	Test temperature (^oC)	RoA (%)
1	M-L1	900	5.06
2	M-L2	900	7.99
3	M-L3	850	13.13
4	M-L4	850	14.05
5	M-L5	800	24.17
6	M-L6	800	13.66
7	M-L7	750	29.46
8	M-L8	750	16.21

Note. The result shows that at 750°C–900°C, all welded joints have an average RoA less than 20%, which means all welded joints have a reheat cracking susceptibility in this temperature range, and the reheat cracking susceptibility increases with the rising temperature. All fractures occurred at the weld, which means the reheat cracking susceptibility of the weld is higher than that of HAZ and base material.