TY - JOUR
T1 - Constant current vs. constant power control in AC resistance spot welding
AU - Zhou, Kang
AU - Yao, Ping
AU - Cai, Lilong
N1 - Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
PY - 2015/9/1
Y1 - 2015/9/1
N2 - Constant current control (CCC) and constant power control (CPC) are two of the most popular control strategies employed in resistance spot welding (RSW). They have their individual respective advantages; for example, with CCC, it is easy to control energy delivery, while CPC can deliver more heat in particular situations. CPC can be accomplished by means of CCC. The performance of CPC is not as good as that of CCC, because CPC involves more interfering elements. Dynamic resistance is employed to analyze the welding process. Corresponding analysis shows a more reliable welding process can be obtained and the first melting point can be detected earlier when CCC is employed rather than CPC. Though the overall nugget growth trends may show a very small difference when using one strategy versus the other, CCC can provide a larger nugget size because the initial energy allotment is more reasonable and the energy delivery is much steadier. We conducted experiments to validate all of the theoretical analysis. This work can serve to inform actual welding production to obtain a more reliable welding process, enable welders to choose a proper control strategy and help improve energy efficiency in practice.
AB - Constant current control (CCC) and constant power control (CPC) are two of the most popular control strategies employed in resistance spot welding (RSW). They have their individual respective advantages; for example, with CCC, it is easy to control energy delivery, while CPC can deliver more heat in particular situations. CPC can be accomplished by means of CCC. The performance of CPC is not as good as that of CCC, because CPC involves more interfering elements. Dynamic resistance is employed to analyze the welding process. Corresponding analysis shows a more reliable welding process can be obtained and the first melting point can be detected earlier when CCC is employed rather than CPC. Though the overall nugget growth trends may show a very small difference when using one strategy versus the other, CCC can provide a larger nugget size because the initial energy allotment is more reasonable and the energy delivery is much steadier. We conducted experiments to validate all of the theoretical analysis. This work can serve to inform actual welding production to obtain a more reliable welding process, enable welders to choose a proper control strategy and help improve energy efficiency in practice.
KW - Constant current control
KW - Constant power control
KW - Control strategy
KW - Nugget growth
UR - https://www.scopus.com/pages/publications/84929454457
U2 - 10.1016/j.jmatprotec.2015.04.016
DO - 10.1016/j.jmatprotec.2015.04.016
M3 - Article
AN - SCOPUS:84929454457
SN - 0924-0136
VL - 223
SP - 299
EP - 304
JO - Journal of Materials Processing Technology
JF - Journal of Materials Processing Technology
ER -
