Work report of 21-22 weeks.docx

Work Report1 The work that I have done in the two weeks: SWAP AMX602 samples prepared by the M6 tool(the diameter of the pin is 6mm) a. The hardness test of the samples that prepared at a weld speed of 350mm/min and 400mm/min(rotation speed 1100rpm, load 800kg)abFig.1. Hardness across the cross section of FS-welded joints of samples that prepared at a weld speed of 350mm/min and 400mm/minThe result of the hardness of the samples after FSW showed that the hardness of the stir zone lower that the base metal. In fig.1.(b), it could find that the hardness of the right side of the sample was higher than the left side. It may be caused by the right side plate. I will test the hardness of the base metal of the right side plate.b. The tensile test on the samples with different parameters.300mm/min250mm/minFig.2. Tensile strength of AMX602 alloys welded at various traveling speeds with the constant rotation speed of 1100rpm(tool m6)400mm/min350mm/min The tensile strength of the joints after FSW was lower than the base metal. The 300mm/min ones had the highest tensile strength. But the tensile strength of the samples was not stable. It could be found that the fracture always occurred in the advance side of the joints of the samples welded by 250mm/min and 300mm/min, while it occurred in the middle of the joints of the 350mm/min and 400mm/min. SWAP AMX602 samples prepared by the M5 tool(the diameter of the pin is 5mm)materialload(kg)Tool rotation speed(rpm)Traveling speed(mm/min)Results1SWAP80011002502SWAP80011003003SWAP80011003504SWAP8001100400From the results, it could be found that there is no defect on the joints surface.a. The hardness test of the samples that prepared at a weld speed of 250mm/min and 300mm/min(rotation speed 1100rpm, load 800kg)Fig.3. Hardness across the cross section of FS-welded joints of samples that prepared at a weld speed of 350mm/min and 400mm/min It could be found that the hardness of the joints was lower than the base metal.b. The tensile test on the samples with different parameters.300mm/min250mm/minFig.4. Tensile strength of AMX602 alloys welded at various traveling speeds with the constant rotation speed of 1100rpm(tool m5)350mm/min400mm/min The tensile strength of the joints after FSW was lower than the base metal. The 250mm/min and 300mm/min ones had the highest tensile strength. But the tensile strength of the samples was not stable. It could be found that the fracture always occurred in the advance side of the joints of the samples welded by 250mm/min and 300mm/min, while it occurred in the middle or the retreat side of the joints of the 350mm/min and 400mm/min. The tensile strength of the joints prepared by new tool (M5) did not higher than the ones prepared by the tool (M6). But the ones prepared by the new tool were more stable.c. The microstructure of the sample welded in 300mm/min.MacrostructureBM10m10m10mTMAZSZThe microstructure of the sample showed that there was no defect on the surface of cross section. The grain shape of the SZ became equiaxed, at the same time, it could be found that the gain size at SZ was coarse