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Development of CAD tool for optimal spot weld joints

점용접 위치의 최적화를 위한 CAD Tool 개발

Ryu, Si-Uk;Lee, Jong-Chan;Lee, Tae-Soo
류시욱;이종찬;이태수

  • Published : 1998.01.01

Abstract

Spot welding palys a key role in increasing productivity and weight reduction of the final products. This paper proposes a systematic approach on the design of spot weld configuration, dealing with the requried number and location of spot weld joints under the given design parameters, such as the applied loads, lap area, and individual spot weld strength. The optimal design of a spot-welded joint is postulated as a state when the safety factors of all spot weld points (i) are evenly distributed and (ii) reach maximum value. A CAD program is developed to arrange the optimal location of each spot weld based on the derived objective function and constraints. The CAD tool integrates the optimization procedure with Finite Element Analysis (FEA) code through an interface. The interface automatically provides geometrical data and mesh configuration for different spot weld locations to FEA model. It also extracts the transmitted load of each spot weld from the FEA code, and allows the optimization code predict an improved arrangement of spot weld locations. The feasibility of the developed approach is demonstrated by the selected examples.

Keywords

CAD Program;Spot Welding;Optimal Design;Failure Envelope;Safety Factor;Optimal Nugget Location