• Title/Summary/Keyword: Filler Wire

Search Result 40, Processing Time 0.083 seconds

Study on the porosity formation in the lap joint CW Nd:YAG laser welds of 6K21 aluminum alloy sheet (6K21 알루미늄 판재의 레이저 겹치기 용접 시 발생하는 기공에 관한 연구)

  • Yang, Hyun-Seok;Lee, Kyoung-Don;Kim, Yong;Park, Ki-Young
    • Laser Solutions
    • /
    • v.11 no.3
    • /
    • pp.16-20
    • /
    • 2008
  • The lap Joint welding of 6K21 aluminum sheets by Nd:YAG laser were performed with an aluminum 5183 filler wire or without a filler wire. The porosity of laser welding beads were observed through an optical microscope and X-ray photography with various levels of welding speed and gap size. The porosity was observed in the gap between upper and lower sheet near a heat affected zone when autogenous welding. Decrease of welding speed and use of AA5183 filler wire reduced porosity significantly.

  • PDF

Study on the welding characteristic of aluminum laser weld using filler wire (용가 와이어를 이용한 알루미늄 레이저 용접부의 용접 특성에 관한 연구)

  • Park, Young-Whan;Park, Hyunsung;Rhee, Sehun
    • Laser Solutions
    • /
    • v.8 no.3
    • /
    • pp.11-19
    • /
    • 2005
  • In automotive industry, light weight vehicle is one of issues because of the air pollution and the protection of environment. Therefore, automotive manufacturers have tried to adopt light materials such as aluminum alloy to production line. Aluminum welding using laser has some advantages high energy density and high productivity. It is very important to understand weld characteristic according to welding condition in order to determine the possibility of application to car body. In this study, Nd:YAG laser welding of 5182 aluminum alloy with filler wire AA5356 was carried out through experimental design according to wire feed rate, laser power and welding speed. Weld bead shape in terms of cross section photo, bead with, height of reinforcement and penetration depth and mechanical property in terms of tensile strength and formability was investigated. Analysis of variation (ANOVA) was performed to know the effect of weld parameter for weldability, laser power was statistically most significance factor of three variables.

  • PDF

A Study of Process Parameters Optimization Using Genetic Algorithm for Nd:YAG Laser Welding of AA5182 Aluminum Alloy Sheet (AA5182 알루미늄 판재의 Nd:YAG 레이저 용접에서 유전 알고리즘을 이용한 공정변수 최적화에 대한 연구)

  • Park, Young-Whan;Rhee, Se-Hun;Park, Hyun-Sung
    • Proceedings of the KSME Conference
    • /
    • /
    • pp.1322-1327
    • /
    • 2007
  • Many automotive companies have tried to apply the aluminum alloy sheet to car body because reducing the car weight can improve the fuel efficiency of vehicle. In order to do that, sheet materials require of weldablity, formability, productivity and so on. Aluminum alloy was not easy to join these metals due to its material properties. Thus, the laser is good heat source for aluminum alloy welding because of its high heat intensity. However, the welding quality was not good by porosity, underfill, and magnesium loss in welded metal for AA5182 aluminum alloy. In this study, Nd:YAG laser welding of AA 5182 with filler wire AA 5356 was carried out to overcome this problem. The weldability of AA5182 laser welding with AA5356 filler wire was investigated in terms of tensile strength and Erichsen ratio. For full penetration, mechanical properties were improved by filler wire. In order to optimize the process parameters, model to estimate tensile strength by artificial neural network was developed and fitness function was defined in consideration of weldability and productivity. Genetic algorithm was used to search the optimal point of laser power, welding speed, and wire feed rate.

  • PDF

Optimization of Process Parameters Using a Genetic Algorithm for Process Automation in Aluminum Laser Welding with Filler Wire (용가 와이어를 적용한 알루미늄 레이저 용접에서 공정 자동화를 위한 유전 알고리즘을 이용한 공정변수 최적화)

  • Park, Young-Whan
    • Journal of Welding and Joining
    • /
    • v.24 no.5
    • /
    • pp.67-73
    • /
    • 2006
  • Laser welding is suitable for welding to the aluminum alloy sheet. In order to apply the aluminum laser welding to production line, parameters should be optimized. In this study, the optimal welding condition was searched through the genetic algorithm in laser welding of AA5182 sheet with AA5356 filler wire. Second-order polynomial regression model to estimate the tensile strength model was developed using the laser power, welding speed and wire feed rate. Fitness function for showing the performance index was defined using the tensile strength, wire feed rate and welding speed which represent the weldability, product cost and productivity, respectively. The genetic algorithm searched the optimal welding condition that the wire feed rate was 2.7 m/min, the laser power was 4 kW and the welding speed was 7.95 m/min. At this welding condition, fitness function value was 137.1 and the estimated tensile strength was 282.2 $N/mm^2$.

Characteristics of the laser brazing on AZ31 magnesium alloy and Zn coated steel dissimilar joint (AZ31 마그네슘합금과 아연도금강판 이종소재의 레이저 브레이징 특성)

  • Lee, Mok-Young;Kim, Sook-Whan;NASIRI, ALI M.;ZHOU, NORMAN Y.
    • Laser Solutions
    • /
    • v.17 no.1
    • /
    • pp.7-12
    • /
    • 2014
  • The dissimilar welding between magnesium alloy and steel sheet was required in automobile industry to increase the strength of the dissimilar joints. Laser brazing is one of the good joining processes for Mg- steel dissimilar joint. In this study, AZ31 magnesium alloy and Zn coated steel dissimilar joint was brazed using diode direct laser with Mg600 filler wire and Superior #21 flux. The wetting of Mg filler wire on Zn coating was very good because of the formation of eutectic phase with low melting temperature. The strength of the brazed joint between AZ31 magnesium alloy and Zn coated steel was 131.3N/mm. The fracture occurred at brazement.

  • PDF