컴퓨처 시뮬레이션을 이용한 저항용접에 관한 연구

Abstract

저항용접 과정의 열-기계적 접합현상은 기계적이며 열적 및 전기적 인자들의 상호작용으로 대단히 복잡하다. 저항용접에 대한 많은 연구가 실험을 통하여 수행되었으나 컴퓨터를 이용한 연구는 별로 행하여지지 않았다. 그러므로 본 연구의 목적은 저항용접과정을 유한요소법을 이용한 컴퓨터 시뮬에이션을 통하여 해석하므로 실험적인 해석방법에서 소요되는 많은 시간과 비용을 절감코자 함이다.

컴퓨터 시뮬레이션에 사용한 도구는 상용 ANSYS Program Package를 사용하였으며 2차원 축대칭 모델을 사용하여 같은 두께의 두 시편에 대한 저항용접과정을 조사하였다. 또한 용접 전류치의 변화와 두께가 다른 두개의 시편과 재질이 다른 두개의 시편에 대하여도 조사하였다.

여기서 얻어진 결과들은 실험적인 결과들과 잘 일치하였으며 이를 통하여 저항용접과정에서 나타나는 응력분포, 변형, 온도분포, 열팽창 및 용접 Nugget의 성장등을 예측할 수 있었다. 또한 저항용접 과정에 대한 컴퓨터 시뮬레이션 및 유한 요소 모델이 신뢰성과 적응성이 있음을 확인하였다.

The thermomechanical coupling phenomena in the resistance welding process is complicated due to interactions of mechanical, thermal and electrical factors.

Although experimental investigations of resistance spot welding have been enrried out, but there are a few by computer simulation, so the purpose of this research is to decrease the time and cost much required in experimental investigation by carrying out the analysis of the resistance spot welding process through computer simulation based on the finite element method.

The tool used in the computer simulation is the commercial ANSYS program package. A two dimensional axisymetric model is used to simulate the resistance spot welding for two stainless steel sheets of equal thickness and parametric study is carried out for variable welding current, workpieces of unequal thickness and dissimilar materials.

The results from the computer simulation are in good agreement with the experimental one. Through these results, such items as stress distribution, temperature profiles, thermal expansion and weld nugget formation are predicted.

Reliability and applicability of finite element models have been demonstrated to simulated and to analyze the resistance spot welding process.

The thermomechanical coupling phenomena in the resistance welding process is complicated due to interactions of mechanical, thermal and electrical factors.

Although experimental investigations of resistance spot welding have been enrried out, but there are a few by computer simulation, so the purpose of this research is to decrease the time and cost much required in experimental investigation by carrying out the analysis of the resistance spot welding process through computer simulation based on the finite element method.

The tool used in the computer simulation is the commercial ANSYS program package. A two dimensional axisymetric model is used to simulate the resistance spot welding for two stainless steel sheets of equal thickness and parametric study is carried out for variable welding current, workpieces of unequal thickness and dissimilar materials.

The results from the computer simulation are in good agreement with the experimental one. Through these results, such items as stress distribution, temperature profiles, thermal expansion and weld nugget formation are predicted.

Reliability and applicability of finite element models have been demonstrated to simulated and to analyze the resistance spot welding process.