Tham khảo tài liệu 'laser welding part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 114 Laser Welding TRIP600 V V V DW9 DW10 DW11 DW12 dtc1 dtc2 V V 1 V DW22 DW23 QS13 QS14 V V V Dw13 DW14 DW15 DW16 dtc5 dtc6 V V DW18 QS7 QS8 QS9 V V Qs10 QS11 QS12 V V Dw24 DW25 DW25 DW27 QS15 QS16 Bending tests DP800 V V DWb19 DWb20 QSbl QSb2 DP800 DP600 V V 2 Dwb21 QSb3 QSb4 1 Laser-welding using two parallel welds Legend of test nomenclature 2 Tube manufacturing using tailor-welded DW drop-weight crush tests blanks DWb drop-weight bending tests dtc crush tests at 250 mm s dtcb bending tests at 250 mm s QS quasi-static crush tests QSb quasi-static bending tests Table 2. Summary of experimental program 973 ------------------- -------------------- Fig. 6. Schema of set-up for bending tests Laser welding application in crashworthiness parts 115 P 3 1 a b Fig. 7. a b . Details of tubes manufactured using tailor welded blanks Quasi-static tests on thin-walled tubes were performed on a DARTEC M1000 machine with a 600kN capacity. The DARTEC machine was operated at a constant cross-head speed of mm s. During the tests the compressive load and displacement were measured using a strain-gauge load-cell and a LVDT. The machine was controlled by a PC that also recorded and processed the measured data from the test machine. The entire crushing process was composed of individual strokes of 90 mm displacement as the test machine was only capable of performing strokes to a maximum of 100 mm extension. The bending tests were performed with only one stroke of 90 mm displacement. Several tests were performed at intermediate speeds of approximately 250 mm s using a DARTEC testing machine with a load capacity of 250kN. The control of the test machine and recording of data also made use of a PC. In this equipment the specimens were placed centrally and upright between two endplates but without any further support. The impact tests were conducted on a drop hammer. The crush tubes were impacted at their top by a falling mass which was laterally guided by rails. The specimens were .
