10 A Novel High-Efficiency Keyhole Tungsten Inert Gas …
351
(a)
(b)
(c)
(d)
(e)
50 μm
200 μm
50 μm
WA
GBA
IGA
50 μm
IGA
GBA
WA
Fig. 10.35 Microstructure (Test no. 4). a Welded joint, b BM, c BM to WM transition zone, d HAZ,
e WM
Figure 10.36 shows the Euler diagram of the welded joint. Table 10.8 lists the
average grain sizes and the proportion of the phase in welded joint. The grain size
and the shape in the HAZ and WM are obviously compared with the comparative
example and the BM. In the BM, the grain size is small, and the proportion of the two
phase is close. In the HAZ, the grain size is not uniform. The proportion of two phases
351
(a)
(b)
(c)
(d)
(e)
50 μm
200 μm
50 μm
WA
GBA
IGA
50 μm
IGA
GBA
WA
Fig. 10.35 Microstructure (Test no. 4). a Welded joint, b BM, c BM to WM transition zone, d HAZ,
e WM
Figure 10.36 shows the Euler diagram of the welded joint. Table 10.8 lists the
average grain sizes and the proportion of the phase in welded joint. The grain size
and the shape in the HAZ and WM are obviously compared with the comparative
example and the BM. In the BM, the grain size is small, and the proportion of the two
phase is close. In the HAZ, the grain size is not uniform. The proportion of two phases