52
N. K. Jha et al.
Fig. 6 Welded joint by
changing the aluminum to
retracting side front side
coupon
Fig. 7 Welded joint by
changing the aluminum to
retracting side and backside
coupon
3.2 Effect of Material Position
It was observed that the joint seems to be better at 380 rpm having free from welding
defect, so it was decided to initiate the joining process by varying the offsets and
position of material specimens. When with the same parameter used in 380 rpm, we
just change the Al to the retracting side, we observed that there was much difference
in terms of surface finish of the joint along with flash seen on both Al and nylon parts
as shown in Fig. 6. When we observe the backside of the joint, an amount of nylon
was found to be on Al sides which gives us clarity about the possibility of joining
the nylon to aluminum shown in Fig. 7.
3.3 Effect of Offset
Further, experiments were performed under changing the offset. Figure 8a shows
the welding done by taking offset 7 mm toward aluminum, and the weld finish was
stable and seems fully distribution of two materials. When we observed backside of
welded component, it shows that some part of aluminum is placed over nylon which
gives the idea of the good joint. In the second experiment, the offset to 3 mm toward
aluminum and joint formed is shown in Fig. 8c. It can see the surface where the slag
is formed making the gap between the weld and the flash formed clearly visible.
Under the root side, some part of molten nylon was spread all over the aluminum
in an irrespective manner which looks like the poor quality of the weld as shown in
Fig. 8d because when at less offset that means nylon has developed excessive heat.
N. K. Jha et al.
Fig. 6 Welded joint by
changing the aluminum to
retracting side front side
coupon
Fig. 7 Welded joint by
changing the aluminum to
retracting side and backside
coupon
3.2 Effect of Material Position
It was observed that the joint seems to be better at 380 rpm having free from welding
defect, so it was decided to initiate the joining process by varying the offsets and
position of material specimens. When with the same parameter used in 380 rpm, we
just change the Al to the retracting side, we observed that there was much difference
in terms of surface finish of the joint along with flash seen on both Al and nylon parts
as shown in Fig. 6. When we observe the backside of the joint, an amount of nylon
was found to be on Al sides which gives us clarity about the possibility of joining
the nylon to aluminum shown in Fig. 7.
3.3 Effect of Offset
Further, experiments were performed under changing the offset. Figure 8a shows
the welding done by taking offset 7 mm toward aluminum, and the weld finish was
stable and seems fully distribution of two materials. When we observed backside of
welded component, it shows that some part of aluminum is placed over nylon which
gives the idea of the good joint. In the second experiment, the offset to 3 mm toward
aluminum and joint formed is shown in Fig. 8c. It can see the surface where the slag
is formed making the gap between the weld and the flash formed clearly visible.
Under the root side, some part of molten nylon was spread all over the aluminum
in an irrespective manner which looks like the poor quality of the weld as shown in
Fig. 8d because when at less offset that means nylon has developed excessive heat.