• Title/Summary/Keyword: weld line

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Design of Weld Line of a Tailor Welded Blank by Inverse Finite Element Analysis (유한요소 역해석을 이용한 Tailor Welded Blank의 용접선 설계)

  • Lee, Choong-Ho;Huh, Hoon;Han, Soo-Sik
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1997.10a
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    • pp.89-92
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    • 1997
  • Design of a weld line in a tailor welded blank is indispensable for good manufacturing of stamped parts as assigned, since the intial weld line is distorted severely with forming. The initial weld line has to be determined such that desired weld line in a formed part can be obtained. The initial weld line was predicted by inverse finite element analysis from the desired weld line in a formed part. The inverse approach is applied to the cylindrical and square cup drawing with tailor welded blanks. The applications demonstrates that the approach is useful for design of weld line of tailor welded blank.

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Effects of Injection Conditions on the Weld Line Creation in Injection Molding (사출성형 시 성형조건이 웰드라인의 생성에 미치는 영향)

  • Kim, Young-Mo;Park, Yeong-Min;Jang, Min-Kyu;Jeong, Yeong-Deug
    • Design & Manufacturing
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    • v.6 no.2
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    • pp.1-5
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    • 2012
  • Weld line in injection molded part is one of the defects in injection molding process. Weld line deteriorates not only appearance quality but mechanical property. In this study, ABS and PP were used as experimental materials. And weld line length, depth and strength have been examined according to the injection molding conditions. As the results of experimental studies, weld line length increased as flow rate increases for all materials. And the flow rate is most influenced to the creation of weld line length. Also weld line strength increased, as flow rate and melt temperature increase for all materials. The whole experiment results was similar to CAE analysis results.

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Effects of Injection Conditions on the Weld Line Creation in Injection Molding (사출성형시 성형조건이 웰드라인의 생성에 미치는 영향)

  • Kim, Young-Mo;Park, Yeong-Min;Jang, Min-Kyu;Jeong, Yeong-Deug
    • 한국금형공학회:학술대회논문집
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    • 2008.06a
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    • pp.115-119
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    • 2008
  • Weld line in injection molded part is one of the defects in injection molding process. Weld line deteriorates not only appearance quality but mechanical property. In this study, ABS and PP were used as experimental materials. And weld line length, depth and strength have been examined according to the injection molding conditions. As the results of experimental studies, weld line length increased as flow rate increases for all materials. And the flow rate is most influenced to the creation of weld line length. Also weld line strength increased, as flow rate and melt temperature increase for all materials. The whole experiment results was similar to CAE analysis results.

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A Study on the Weld Line Position for Hydroforming (Weld line위치에 따른 Hydroforming특성에 관한 연구)

  • 강대철;윤석만;전병희;오수익;전한수
    • Transactions of Materials Processing
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    • v.9 no.5
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    • pp.504-511
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    • 2000
  • Hydroforming is a forming process enabling circular metal tubes to be produced in complex cross sections along curved axial paths. This forming process is widely used to manufacture parts in automotive industry. This paper presents bending and forming results to following angle of weld line positions. These compare to good bending, bad bending and without weld line model case. And then this result of after forming compare to each forming cases. The purpose of this paper is found that adaptive weld line position for bended final shape.

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A Study on the Weld Line Strength in Injection Molded Part (사출성형품의 웰드라인 강도에 관한 연구)

  • 모정혁;홍형식;류민영
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.10a
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    • pp.211-216
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    • 2003
  • Weld line in injection molded part is one of the defect in injection molding process. Weld line deteriorates not only appearance quality but mechanical property. In this study weld line strength has been examined according to the injection operational conditions, materials and mold designs. PC and PP were used, and four different specimens were used in this experiment. Weld line strength decreased as injection temperature increases for PC. It was more dependent on mold temperature than injection temperature for PP Among the four different specimens, uneven thickness specimen showed the highest weld line strength.

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Flow Analysis for an Effective Weld Line Control in Injection Molding (효과적인 웰드라인 제어를 위한 사출성형 유동해석)

  • 김현필;김용조
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.10 no.2
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    • pp.64-72
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    • 2001
  • Weld line is one of serious troubles which are observed in a plastic part manufactured by a injection molding process. This is caused by many process factors, which are molding pressure, temperature, velocity, location of a injection gate, mold geometry and material properties. investigation on the effects of these process factors to the appearance of a weld line was carried out using a finite element method. Filling and packing analyses were carried out by modifying both the configuration of the injection gates and cavity thickness. Proper locations of the injection gates could be determined by considering molding pressure, temperature, velocity and frozen layer, and whereby the weld line was controled. In order to make a weak appearance of the weld line, flow velocity and flow front in a cavity were also investigated by modifying a cavity thickness. As a result, flow front was extended around the corner in the cavity by changing the flow velocity and hence the appearance of the weld line was much weakened.

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A Study on the Weld Line Position Optimization for Hydroforming (Hydroforming을 위한 Weld line 최적배치에 관한연구)

  • 전병희
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.9 no.3
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    • pp.160-168
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    • 2000
  • Hydroforming is a metal forming process that enables circular metal tubes to be formed in to the parts with the complex cross section along the curved axial direction. Recently this hydroforming process is largely used for the production of the automotive parts. This paper presents the results of tube bending and hydroforming simulations in cases of the varying weld line positions of the tube. Ten cases of prebending and hydroforming simulations are carried out to find the optiaml weld line position.

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Formability Study on Weld Line Location and Movement of Laser-Tailor Welded Blanks

  • Hong, Joo-Pyo;Kim, Heon-Young;Oh, Soo-Ik
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1997.03a
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    • pp.19-24
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    • 1997
  • The weld line location and the weld line movement in stamping with laser-tailor welded blanks(TWB) were investigated through square cup deep drawing tests. The step blank holder was introduced to form TWB of different thicknesses without wrinkling, and the non-uniform blank holding force(BHF) was enforced to control weld line movement. Test results of the blanks with shifted weld lines showed that the large portion of the thinner area could result in a large weld line movement. Careful selection of the weld line location and the BHF control should be adapted in TWB design to avoid failures and to ensure its formability.

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A Study on Weld Line Detection and Wire Feeding Rate Control in GMAW with Vision Sensor (GMAW에서 시각센서를 이용한 용접선 정보의 추출과 와이어 승급속도의 제어에 관한 연구)

  • 조택동;김옥현;양상민;조만호
    • Journal of Welding and Joining
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    • v.19 no.6
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    • pp.600-607
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    • 2001
  • A CCD camera with a laser stripe was applied to realize the automatic weld seam tracking in GMAW. It takes relatively long time to process image on-line control using the basic Hough transformation, but it has a tendency of robustness over the noises such as spatter and arc light. For this reason. it was complemented with adaptive Hough transformation to have an on-line processing ability for scanning specific weld points. The adaptive Hough transformation was used to extract laser stripes and to obtain specific weld points. The 3-dimensional information obtained from the vision system made it possible to generate the weld torch path and to obtain the information such as width and depth of weld line. We controled the wire feeding rate using informations of weld line.

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A study on the weld-strength in two-shot molding (이중 사출시 발행하는 Weld-line의 강도 연구)

  • Jang, Min-Kyu;Kim, Chang-jin;Choi, Hea-Suck;Jeong, Yeong-Deug
    • Design & Manufacturing
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    • v.9 no.2
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    • pp.30-33
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    • 2015
  • In injection molding, many kinds of defects have occurred because of a characteristic of plastics injection molding. Weld line is one of the defects is formed when separated melt fronts recombine together during the mold filling stage. That is one of problems in injection molding. Weld lines in the appearance of plastics parts can deteriorate visible quality. And most importantly, the local mechanical strength in the weld line area can be significantly weaker. It could be one of the most problems for structural applications. In this study, the mold available two-shot-molding of same polymers have been designed, and a series of experiment about tensile strength in weld line area has been conducted using Taguchi's design of experiment to optimize injection molding conditions decreasing of weld strength and find out a factors affected weld strength in two-shot- molding.

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