• Title/Summary/Keyword: Arc welding

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The Experimental Study of Flux Improvement of Wet Underwater Arc Welding Electrode (습식 수중 용접봉의 피복제 개발에 관한 기초연구)

  • Kim, Min-Nam;Kang, Jung-Gun
    • Journal of Ocean Engineering and Technology
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    • v.13 no.4
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    • pp.28-36
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    • 1999
  • Wet underwater arc welding process is investigated by using experimentally developed flux coated underwater arc welding electrode and SS400 steel plate of 12mm thickness as base metal. Three kinds of different flux covered wet arc welding electrode of 4mm diameter(BK-01, BK-02, BK-03) are individually developed, and one of the improved underwater welding electrode (BK-03) may be put to practical use for underwater wet arc welding process. The results obtained from this experimental study are as follows : 1. Arc stability of developed underwater wet welding electrode is better than that of the domestic covered arc welding electrode. 2. Workability of welding electrode, remove ability of slag and bead appearances using improved underwater wet welding electrode are remarkably better than that of others. 3. Heat affected zone of test specimen welded in the underwater gets to become a lot smaller than that of test specimen welded in the air, and the maximum hardness of heat affect zone of developed underwater wet welding electrode is lower to that of domestic arc welding electrode.

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A Study of Mechanical Properties of Underwater Wet Welding Electrode (습식 수중 용접봉의 기계적 성질에 관한 연구)

  • 김민남;김복인;한정동
    • Journal of Ocean Engineering and Technology
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    • v.14 no.4
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    • pp.56-61
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    • 2000
  • This study has been performed for mechanical properties of underwater wet welding electrode with rolled steel (KR-RA) for ship structure, one kind (E 4313) of domestic covered arc welding electrode used in the air and two kinds (UWE-01, UWE-02) of underwater covered arc welding electrode experimentally developed on the same welding condition. The results obtained were as follows : The hardness value of underwater covered arc welding electrode (UWE-01) was about 8.3% lower than domestic covered arc welding electrode(E 4313) in heat affected zone of test of UWF-02 was lower about 4.5%. Tensile strengths of UWE-01 were about 0.9%, and those of UWE-02 were about 6.5% higher than those of domestic covered arc welding electrodes (E 4313) in test specimens. The impect value of UWE-01 were about 15.5%, and those of UWE-02 were about 21.7% highter than those of domestic covered arc welding electrodes(E 4313) in test specimens. So mechanical properties of the underwater arc welding electrode were improved by the composition ratios of covering materials.

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The Evaluation of Mixed-welded SM 490A Steel by Acoustic Emission (1) (음향방출법에 의한 SM490A강의 복합용접성 평가 (1))

  • 이장규;우창기;박성완;김봉각;윤종희;인승현
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.170-173
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    • 2002
  • The object of this study is to investigate the effect of compounded welding through the AE (Acoustic Emission) characteristics on static tensile test. This study was carried out a SM 490A, high tension steel using the low hydrogen type E4316 of electronic shield metal arc welding and compound wire of $CO_2$gas arc welding. $CO_2$welding, weak in the intensity of HAZ (Heat Affected Zone), can be improved by being combined with coated arc welding, Coated arc welding, weak in the intensity of the bead, can be improved by being combined with $CO_2$welding. Especially, electronic coated arc welding and $CO_2$welding complement the mechanical intensity of HAZ and the bead with each other. So, compounded welding increases the intensity in the special parts and enhances the quality of goods.

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A Study on the Acoustic Emission Characteristics of Weld Heat Affected Zone in SWS 490A Steel(1) (SWS 490A 강의 용접 열영향부 음향방출 특성 에 대한 연구(1))

  • 이장규;우창기;박성완;윤종희;조진호;김봉각;구영덕
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.13 no.4
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    • pp.113-120
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    • 2004
  • The object of this study is to investigate the effect of compounded welding through the AE(Acoustic Emission) characteristics for weld HAZ(Heat Affected Zone) under the static tensile test. This study was carried out an SWS 490A, high tension steel for electric shield metal arc welding(SMAW), $CO_2$ gas arc welding and TIG welding. Data displays are based on the measured parameters of the AE signals, along with environmental variables such as time and load. The accumulated AE event curve of HAZ definitely have the point of inflection subject to tensile test. The results of the tensile test of HAZ come out electric shield arc welding >$CO_2$ gas arc welding>TIG welding in case of single welding, but generally the tensile test of HAZ come out electric shield arc welding> TIG welding > $CO_2$ gas arc welding. These history plots give us useful and powerful information to analyze the results of material evaluation testing.

PRACTICAL APPLICATION OF ARC WELDING ROBOT AND JOINT DESIGN FOR ROBOT WELDING OF STEEL STRUCTURES

  • Horikawa, Kohsuke
    • Proceedings of the KWS Conference
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    • pp.3-9
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    • 1992
  • This paper introduces the present status of application of arc welding robots, construction, engineering subjects, design requirement, example of design modification for welding by arc welding robot. As a conclusion closer cooperation of robot engineer, welding engineer and structural designer is emphasised. This is the summary of the work done by Working Group for IIW Commission XV, chaired by the author.

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Technology on Arc Welding Machine of Aluminum by Digital Control (디지털 제어를 이용한 알루미늄 아크 용접기의 기술현황)

  • Lee, Chang-Je;Kim, Yu-Chan;Kim, Jong-Do
    • Journal of Welding and Joining
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    • v.31 no.1
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    • pp.26-32
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    • 2013
  • Recently, welding technology of nonferrous metals which were difficult to implement by arc welder has become available through digitalization of arc welding machine. Among them, the welding quality improvement of aluminum welding is very noticeable. These results increase the arc stability by controlling arc current and voltage waveform precisely, and control wire feed speed by synchronizing with arc current which the feed rate of filler wire is controlled by a precise motor control of servomotor and not by a simple constant speed feeding. Not only through the hardware digitalization of arc welding machine but also through advance of software of arc welding, it became possible to implement a certain level of welding quality by a simple operation. These led to CMT welding process implementation which requires low heat input than current arc welding and highly increased the applicability of the aluminum welding.

An experimental study on the arc stability improvement of underwater wet welding with flux ingredients (피복성분에 의한 수중용접봉의 아크안정성 개선에 관한 실험연구)

  • 김복인;정교헌;김민남
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • pp.276-281
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    • 2001
  • Wet Underwater arc welding process is inverstigated by using experimentally developed flux coated underwater arc welding electrode and SS400 steel plate of 12mm thickness as base metal. Two kinds of different flux covered wet arc welding electrode of 3.2mm diameter (UW-1, UW-2) are individually developed and one of the improved underwater welding electrode (UW-2) may be put to practical use for underwater arc welding process.

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A Study on the Evaluation of Welding Fume Generated during Arc Welding (Arc 용접시 Fume 발생량 평가에 관한 연구)

  • 채현병;김정한;김희남
    • Journal of the Korean Society of Safety
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    • v.13 no.2
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    • pp.65-75
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    • 1998
  • The cases of welders illness by welding fume generated during arc welding are recently reported, which makes the legal regulation in the welding work place. Also, this situation makes the employers and welders be concerned about the welding fume seriously. At this point of time it is necessary that a standard testing method is developed as a fundamental tool for the evaluation of Fume Generation Rate(FGR) required for making progress in the development of low fume electrodes and welding process technology and also constructing the ventilation system in welding area. However, the current standard(KS D 0062) is only applicable to the manual covered electrode arc welding. In this study the evaluation procedure for the FGR is established by developing the fume collection chamber which can be applicable to semiautomatic and automatic arc welding as well as manual arc welding. This evaluation system and procedure can be used as a tool not only to develop the low fume welding electrode and welding process technology but also to construct the equipment controlling the welding workshop atmosphere.

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Microstructural Changes on Weld Heat Input in $60kg/mm^2$ Quenched and Tempered High Strength Steel ($60kg/mm^2$급 조질고장력강의 용접입열량에 따른 미세조직변화)

  • 김은석;정인상;박경채
    • Journal of Welding and Joining
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    • v.11 no.4
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    • pp.79-90
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    • 1993
  • Shielded metal arc welding, one-ploe and two-pole submerged arc welding were accomplished to investigate microstructure changes on phase transformation behavior in $60kg/mm^2$ quenched and tempered high strength steel. Microstructures were examined by optical micrograph and TEM. In shielded metal arc welding (oxygen 250ppm), the inclusions were small size (0.3-0.5$\mu\textrm{m}$)and small in number. In submerged arc welding (oxygen 430-529ppm), the inclusions were larger(0.7-2$\mu\textrm{m}$) than that of shielded metal arc welding and large in number. Microstructure mainly depends on number and distribution of inclusions in fusion zone of weld metal. It was noticed that a limited number of inclusions favors the formation of acicular ferrite.

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Development of Spot Welding and Arc Welding Dual Purpose Robot Automation System (점용접 및 아크용접 겸용 로봇 자동화시스템 개발)

  • Lee, Yong-Joong;Kim, Tae-Won;Lee, Hyung-Woo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.3 no.4
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    • pp.73-80
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    • 2004
  • A dual purpose robot automation system is developed for both arc welding and spot welding by one robot within a cell. The need for automation of both arc welding and spot welding processes is urgent while the production volume is not so big as to accommodate separate station for the two processes. Also, space is too narrow for separate station to be settled down in the factory. A spot welding robot is chosen and the function for arc welding are implemented in-house at cost of advanced functions. For the spot welding, a single pole type gun is used and the robot has to push down the plate to be welded, which causes the robot positioning error. Therefore, position error compensation algorithm is developed. The basic functions for the arc welding processes are implemented using the digital I/O board of robot controller, PLC, and A/D conversion PCB. The weaving pattern is taught in meticulously by manual teach. A fixture unit is also developed for dual purpose. The main aspects of the system is presented in this paper especially in the design and implementation procedure. The signal diagrams and sequence logic diagrams are also included. The outcome of the dual purpose welding cell is the increased productivity and good production stability which is indispensable for production volume prediction. Also, it leads to reduction of manufacturing lead time.

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