“…In particular, for a longer than 20 cy, the maximum welding current decreases sharply. This result is consistent with those of the previously related studies [5, 25]. Figure 2 Welding lobe curve obtained for the SPW with an electrode force of 2.94 kN.…”
Section: Resultssupporting
confidence: 92%
“…In particular, for a longer than 20 cy, the maximum welding current decreases sharply. This result is consistent with those of the previously related studies [5,25]. The maximum nugget size for different welding conditions are shown in Table 2.…”
Section: Weld Lobe Curve and Nugget Size In Spw Schedulesupporting
confidence: 93%
“…In other words, a high welding current/short welding time condition is more successful in creating sufficiently large nuggets compared with long welding time at the lower welding current [4, 5]. There is zero-current cross-points associated with AC as shown in Figure 1.…”
Section: Resultsmentioning
confidence: 99%
“…UHSSs can be classified metallurgically into dual-phase, transformation-induced plasticity, and complex-phase (CP) steels. In addition, they have a yield strength greater than 550 MPa and a tensile strength greater than 700 MPa [1][2][3][4][5][6].…”
This paper presents an innovative approach that uses a pulse-profile to improve the welding quality of CP1180 steel in resistance spot welding process. Three pulses with two cooling times were used in the developed multi-pulse welding (MPW) schedule. The experimental results show that the first pulse increases the contact area between the sheets to improve the current flow pattern. The second pulse was designed to extend the sheet-to-sheet contact area and corona bond for preventing rapid nugget growth. Using these designs, the nugget size was maximised through the third pulse. The maximum nugget size using the designed MPW schedule was 18.5% greater than that of the single-pulse welding schedule and the weldable current range was extended by 130%.
“…In particular, for a longer than 20 cy, the maximum welding current decreases sharply. This result is consistent with those of the previously related studies [5, 25]. Figure 2 Welding lobe curve obtained for the SPW with an electrode force of 2.94 kN.…”
Section: Resultssupporting
confidence: 92%
“…In particular, for a longer than 20 cy, the maximum welding current decreases sharply. This result is consistent with those of the previously related studies [5,25]. The maximum nugget size for different welding conditions are shown in Table 2.…”
Section: Weld Lobe Curve and Nugget Size In Spw Schedulesupporting
confidence: 93%
“…In other words, a high welding current/short welding time condition is more successful in creating sufficiently large nuggets compared with long welding time at the lower welding current [4, 5]. There is zero-current cross-points associated with AC as shown in Figure 1.…”
Section: Resultsmentioning
confidence: 99%
“…UHSSs can be classified metallurgically into dual-phase, transformation-induced plasticity, and complex-phase (CP) steels. In addition, they have a yield strength greater than 550 MPa and a tensile strength greater than 700 MPa [1][2][3][4][5][6].…”
This paper presents an innovative approach that uses a pulse-profile to improve the welding quality of CP1180 steel in resistance spot welding process. Three pulses with two cooling times were used in the developed multi-pulse welding (MPW) schedule. The experimental results show that the first pulse increases the contact area between the sheets to improve the current flow pattern. The second pulse was designed to extend the sheet-to-sheet contact area and corona bond for preventing rapid nugget growth. Using these designs, the nugget size was maximised through the third pulse. The maximum nugget size using the designed MPW schedule was 18.5% greater than that of the single-pulse welding schedule and the weldable current range was extended by 130%.
Several correlations from the professional literature describing the shear and cross tension strength (STS and CTS) of resistance spot welded (RSWed) thin steel sheets were investigated. Some of them need chemical composition or weld nuggets strength hardness as input parameters, making them hardly applicable in the planning stage of the joints. Using STS and CTS data collected from over 250 papers, selected correlations were tested, whether they are applicable to predict the STS and CTS of the RSWed joints at the planning stage to help designers plan their static-loaded welds strength. Most correlations had limitations in the applicable base materials' tensile strength range. Therefore, new equations for STS and CTS are proposed, which can be used to plan in the 300–18900 MPa base metals tensile strength range for similar and dissimilar RSWed joints of thin steel sheets.
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