• Title/Summary/Keyword: Laser weaving

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A Study to Improve Weld Strength of Al 6k21-T4 Alloy by using Laser Weaving Method (레이저 위빙을 이용한 Al 6k21-T4 합금의 용접 강도 향상)

  • Kim, Byung-Hun;Kang, Nam-Hyun;Park, Yong-Ho;Ahn, Young-Nam;Kim, Cheol-Hee;Kim, Jung-Han
    • Journal of Welding and Joining
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    • v.27 no.4
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    • pp.49-53
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    • 2009
  • For Al 6k21-T4 alloy, linear laser welding produced the lower shear-tensile strength than the base metal. This study improved the shear-tensile strength by using the weaving laser at the optimized welding condition, i.e., 2mm weaving width and 25Hz frequency. The large weaving width increased the weld width, therefore improving the joint strength. For the specimen of low strength, the porosity was distributed continuously along the intersection between the plates and fusion line. However, for the optimized welding condition, large oval-shaped porosities were located only in the advancing track of the concave part. Regardless of the welding condition, solidification cracking was initiated at the intersection and propagated through small porosities in the weld part. furthermore, the concave part had more significant porosity in the weld and HAZ, respectively than the convex part. The continuity of porosities played a key role to determine the strength. And, the weaving width was an important parameter to control the strength.

Porosity Reduction in Laser Welding of Nitrided Carbon Steel (질화처리된 저탄소강 레이저 용접부의 기공 감소)

  • Ahn, Young-Nam;Kim, Cheolhee;Lee, Wonbeom;Kim, Jeonhan
    • Journal of Welding and Joining
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    • v.31 no.6
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    • pp.71-76
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    • 2013
  • Gas nitriding is a surface hardening process where nitrogen is introduced into the surface of a ferrous alloy. During fusion welding of nitrided carbon steel, the nitride inside weld metal is dissolved and generates nitrogen gas, which causes porosities - blow holes and pits. In this study, several laser welding processes such as weaving welding, two-pass welding, dual beam welding and laser-arc hybrid welding were investigated to elongate the weld pool to enhance nitrogen gas evacuation. The surface pits were successfully eliminated with elongated weld pool. However blowholes inside the weld metal were effective reduced but not fully disappeared.

Crack Susceptibility Reduction and Weld Strength Improvement for Al Alloy 5J32-T4 by using Laser Weaving Method (레이저 위빙을 적용한 알루미늄 합금 5J32-T4의 용접균열 저감 및 용접강도 향상에 관한 연구)

  • Choi, Kwang-Deok;Ahn, Young-Nam;Kim, Cheol-Hee
    • Proceedings of the KWS Conference
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    • 2009.11a
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    • pp.112-112
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    • 2009
  • 레이저 용접은 아크 용접에 비해 상대적으로 빠른 용접과 깊은 용입이 가능하며, 낮은 열입력을 가지는 장점이 있다. 하지만 알루미늄 합금 용접 시 균열 감수성의 증가 및 용접강도가 저하되는 단점을 가지고 있다. 이러한 단점을 극복하는 방법으로 모재의 화학조성을 제어하는 방법과 부가적인 용접와이어를 공급하는 방법이 제안되었으나 레이저 용접에 적용하기 쉽지 않다. 아크 용접과 전자빔 용접에서는 열원에 오실레이션을 적용하여 결정립 구조를 제어하여 용접강도를 증가하는 방법이 제안되었다. 따라서 본 연구에서는 알루미늄 합금 5J32-T4의 용접균열 저감 및 용접강도 향상을 위해 레이저 위빙을 적용하였다. 1mm 두께의 알루미늄 5J32-T4를 사용하였으며, 4kW급 디스크 레이저와 레이저용 스케너를 이용하여 레이저 위빙을 구현하였다. 고온균열을 평가하기 위해 자기구속형 균열 평가방법을 사용하였으며, 용접강도를 평가하기 위해 겹치기 용접을 수행한 시편을 이용하였다. 고온균열 실험결과 레이저 위빙 적용 시 직선 용접에 비해 균열 감수성이 감소한 것을 확인하였다. 전단인장강도 측정결과 레이저 위빙의 적용에 따라 직선 용접에 비해 높은 전단인장강도의 확보가 가능하였다.

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Study on the Textile Structural Design using SLS 3D Printing Technology -Focused on Design of Flexible Woven Fabric Structure- (SLS 방식의 3D 프린팅 기술을 활용한 직물구조적인 디자인설계 연구 -유연성 있는 직조구조 직물설계를 중심으로-)

  • Song, HaYoung
    • Journal of Fashion Business
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    • v.23 no.3
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    • pp.67-84
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    • 2019
  • Since the early 2000s, various fashion design products that use 3D printing technology have constantly been introduced to the fashion industry. However, given the nature of 3D printing technology, the flexible characteristics of material of textile fabrics is yet to be achieved. The aim of this study is to develop the optimal design conditions for production of flexible and elastic 3D printing fabric structure based on plain weave, which is the basic structure in fabric weaving using SLS 3D printing technology. As a the result this study aims to utilize appropriate design conditions as basic data for future study of flexible fashion product design such as textile material. Weaving structural design using 3D printing is based on the basic plain weave, and the warp & weft thickness of 4mm, 3mm, 2mm, 1.5mm, 1mm, and 0.7mm as expressed in Rhino 6.0 CAD software program for making a 3D model of size $1800mm{\times}180mm$ each. The completed 3D digital design work was then applied to the EOS SLS Machine through Maker ware, a program for 3D printer output, using polyamide 12 material which has a rigid durability strength, and the final results obtained through bending flexibility tests. In conclusion, when designing the fabric structure design in 3D printing using SLS method through application of polyamide 12 material, the thickness of 1 mm presented the optimal condition in order to design a durable digital textile structure with flexibility and elasticity of the 3D printing result.

Development of seam tracking sensing system for welding environment with wall (벽이 있는 용접 환경을 위한 용접선 검출 시스템 개발)

  • Park, Young-Kyun;Byun, Kyung-Seok
    • Journal of the Institute of Convergence Signal Processing
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    • v.11 no.4
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    • pp.338-344
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    • 2010
  • Both ends of welding line are often closed by wall in the welding of ship blocks. In this research, seam tracking sensing system for butt welding in the condition with wall was developed. Seam tracking sensing system measures position of carriage from wall and detects root-pass of welding line. The system consists of the laser displacement sensors and ultrasonic sensors. The laser displacement sensor reciprocal1y rotates by the motor and measures a distance from laser sensor to the welding material. The ultrasonic sensor measures a distance between welding system and walls. The distance measured by the ultrasonic sensor is used to get X(driving) position and to determine initial and end point of the weld line. Y(weaving) and Z(height) of the weld line are obtained by the distance measured by the laser displacement sensor and the orientation of the sensor. The sensing system includes the controller that is independent from the welding carriage. The seam tracking sensing system is attached to both side of welding carriage so that interference between welding torch and sensing system can be avoided during the welding. And both side sensing system minimize dead zone. Finally, developed sensing system was adhered to welding carriage and verified usefulness by experiments.

Creation of Fashion Items Using Traditional Dancheong Patterns - Focused on Bag Designs - (전통 단청문양을 활용한 패션상품 개발 - 가방 디자인을 중심으로 -)

  • Lee, Jae-Young
    • The Journal of the Korea Contents Association
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    • v.20 no.5
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    • pp.545-557
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    • 2020
  • With the increasing interest on K-fashion all over the world, it's the important time to create the items which can express the unique identity of Korea for promoting the globalization of Korean fashion. Accordingly, this study aims to suggest the modern applicability of traditional patterns by designing the bags using the Dancheong patterns(traditional multi-colored decorative painting) which can effectively express Korean images in a variety of shapes and definite visual features and then expand the scope of fashion items. To this end, this study concentrated on expressing the Dancheong patterns to fit to the modern fashion trends by re-interpreting them. The bag was designed using the laser cutting technique, without weaving or digital printing, to imbue the technical emotion and 3D effect to the patterns. In accordance with the analysis results, the features of patterns could be delicately expressed around the shaping and structuring method in terms of the design, and the scope of design for leather goods could be expanded using the laser cutting in technical aspects. For the industrial aspects, it is required to develop differentiated goods expressing the unique emotion of the Korean for globalization of Korean design.

Expression Techniques and Characteristics of Leather in Contemporary Fashion (현대 패션에 나타난 가죽의 표현 기법과 특성)

  • Kim, Sun-Young
    • The Research Journal of the Costume Culture
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    • v.19 no.1
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    • pp.71-82
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    • 2011
  • This paper examined the kinds and characteristics of leather and also analyzed the expression techniques and characteristics of leather in contemporary fashion. The objective of this study lies in re-interpreting the current location of leather in contemporary fashion design, enlarging unlimited potential expression fields of leather, and at the same time, helping create new viewpoints and expression types of leather. For this purpose, this paper examined the kinds and characteristics of leather through the existing literatures, and it also carried out positive analysis of the expression techniques and characteristics of leather clothes through local and foreign fashion magazines and collection papers, such as Gap, Vogue, and Mode & Mode, focusing on the works presented in the fashion collections after 2000. Leather in contemporary fashion is expressed in different colors through dyeing. Through various expression techniques such as wrinkles, ruffle, stitch, embossing, quilting, patchwork, holing, nailing, cutting, laser cutting, fringe, weaving, printing, and collage, leather breaks the fixed ideas of itself and further, it makes the images of fashion design affluent. Leather clothes, which are made through various expression techniques, have some characteristics. First, leather clothes emphasize women's voluptuous beauty. Second, leather clothes create a decorative effect through mixture of materials and various expression techniques. Third, through the feel of materials and the emphasis of shapes, primitive beauty is expressed.