• Title/Summary/Keyword: Gas Metal Arc

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The Effect of Deoxidizers in a Wire on Spatter Generation in Gas Metal Arc Welding (GMA용접에 있어서 스패터 발생에 미치는 와이어 탈산원소의 영향)

  • 방국수;안영호
    • Journal of Welding and Joining
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    • v.14 no.5
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    • pp.145-150
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    • 1996
  • The variation of spatter generation in gas metal arc welding with welding conditions and wire compositions was investigated and interpreted in terms of arc stability. The transition range from a short circuit mode to a spray mode in the mixed gas welding showed an unstable arc and generated the largest amount of spatters. Titanium reduced spatters only in the globular mode of $CO_2$welding and silicon and manganese showed the same effect The effect of silicon and manganese, however, was no longer seen when titanium was added simultaneously to the wire. It is believed that deoxidizers easily form oxides on the anode and make the arc stable even in DCRP welding. The wires with deoxidizers also showed low short circuit frequency, resulting in the increase of large size spatters.

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Evaluation of Gas Metal Arc Welding Characteristics according to Contact Tip Materials (GMA용접에서 콘택트 팁 재질에 따른 용접특성 평가)

  • Kim, Dong Yoon;Hwang, In Sung;Kim, Dong Cheol;Kang, Moon Jin
    • Journal of Welding and Joining
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    • v.32 no.6
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    • pp.35-40
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    • 2014
  • The contact tip for gas metal arc welding has important functions to transmit the welding current to the wire and to guide the wire to molten pool. If the contact tip is damaged, it is a cause of lowering the welding productivity due to removal of welding defects and replacement of contact tip. In case of the use of a contact tip for a long time the arc is unstable because the processed hole in the contact tip center is larger, and the variation of aiming position of the welding wire causes a seam tracking error. In this study, gas metal arc welding experiments using contact tip of three different materials were performed. The contact tips with Cu-P, Cu-Cr, and Cu-ODS were used at the experiments, and the welding characteristics by each contact tip were evaluated. After welding contact tip appearance, welding spatter adhesion amount of the nozzle, and weld bead appearance were evaluated. The welding current and welding voltage were measured to verify arc stability during arc welding.

A Study on Welding Performance Improvement of $CO_2$ Inverter Arc Welding Machine by Arc Reignition Detection (아크 재생 검출에 의한 $CO_2$ 인버터 아크 용접기의 용접성능향상에 관한연구)

  • 이정락
    • Proceedings of the KIPE Conference
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    • 2000.07a
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    • pp.581-586
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    • 2000
  • Gas metal arc welding(GMAW) uses a continuously fed electrode as a filler metal. The arc is shielded from atmospheric contamination by an inert gas active or inert/active gas mixture delivered through the welding gun and cable assembly. The recent research topics on $CO_2$ are welding machines are focused mainly on the reduction method of generated spatter by using new type consumable electrode metal or inverter control method. The various current waveform control methods have been researched for welding performance improvement. Until now current waveform control methods reduce to spatter occurred by instantaneous short circuiting,. but these methods is drawback that no reduce spatter occurred by arc reignition. In this paper the previous arc reignition current control method for welding performance improvement of inverter arc welding machine is studied and compared the various current control methods with the previous arc reignition current control method.

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A Study on On-Line Quality Monitoring Using Arc Light in Gas Metal Arc Welding (GMAW에서 아크 빛을 이용한 실시간 용접품질 모니터링에 관한 연구)

  • 조택동;양상민
    • Journal of Welding and Joining
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    • v.18 no.4
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    • pp.82-86
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    • 2000
  • Gas metal arc welding(GMAW) is regarded as one of the best candidate for welding automation in industrial joining application. It is important to monitor the weld quality for the high performance weld automation. In GMAW, weld quality is closely related to arc stability especially. In this paper, arc light signal is measured and spectrum analyzed to the detect the variation of the weld quality. The FFT of the signal showed that the amplitude variance of FFT power spectrum was very large in poor weld process such as the decrease of weld bead width and height. The results show that it is possible to detect the weld defect position in weld process.

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APPLYING LASER-ARC HYBRID WELDING TECHNOLOGY FOR LAND PIPELINES

  • Booth, G-S;Howse, D-S;Woloszyn, A-C;Howard, R-D
    • Proceedings of the KWS Conference
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    • 2002.10a
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    • pp.169-175
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    • 2002
  • World demand for natural gas has generated the need for many new land transmission pipelines to be installed in the next decade or so. Although mechanized gas metal arc welding is well developed, there are opportunities for cost savings by using alternative welding processes. Hybrid Nd:YAG laser - gas metal arc welding enables fibre optic delivery of the laser energy to a robotic welding head to be combined with the addition of extra energy and a consumable to produce good quality, deep penetration welds in a single pass. The present paper describes initial procedure development to optimize the laser and gas metal arc welding parameters for making joints in pipeline steel. Satisfactory joint quality was obtained and it is intended to develop the process to prototype field trials.

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Effect of Shielding gas Composition on Arc Stability and Transfer mode of High deposition GMA Welding (고용착 GMA 용접의 Arc 안정성 및 용적이행 현상에 미치는 보호gas의 영향)

  • 경규담;천홍정;이정헌;강봉용;김희진
    • Journal of Welding and Joining
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    • v.15 no.1
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    • pp.109-115
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    • 1997
  • The arc stability and the metal transfer mode of high deposition GMA welding were investigated using various compositions of shielding gas with two types of filler, ie solid wire and metal cored wire. As for a solid wire, the transfer mode changed from axial spray to rotational spray with increasing wire feed rate (welding current) and the transition current was different with the gas composition. The gas composition also affected the apparent stability of rotating arc. As for a metal cored wire, on the other hand, no transition occurred and thus spray transfer mode could be applied with the welding current over 500A (deposition rate over 300g/min). Looking for the development of high deposition GMA welding process, above results were discussed in two different ways, one is to elevate the transition current, the other is to stabilize the rotational transfer mode.

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A Study on the Variation of Elements Loss of Wires and Oxygen Content of Weld Metal in GMAW (GMA용접에서 와이어 탈산원소 손실 및 용접금속 산소 변화 연구)

  • 방국수;장웅성
    • Journal of Welding and Joining
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    • v.16 no.2
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    • pp.93-99
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    • 1998
  • The effects of welding conditions of gas metal arc welding on the elements loss of solid wire, oxygen content and impact toughness of weld metals were studied. Deoxidizing elements loss was increased with increase of arc voltage in both short-circuit transfer mode and globular transfer mode. It is believed that increase of arc voltage results in increase of reaction time between elements in the droplet and surrounding gas at the end of wire and in the arc column. Based on the thermodynamic equilibrium model, the oxygen content of weld metal can be predicted with the content of silicon and manganese as following : [%O] = $K([%Si][%Mn])^{-0.25}$, K = -15518/T+6.01. The equilibrium temperature was dependent on shielding gas, and it was 187$0^{\circ}C$ for $CO_2$ gas and 180$0^{\circ}C$ for 20%$CO_2$-80%Ar gas. The oxygen content of weld metal which shows maximum impact toughness was varied with deoxidizing alloy system of wires, 0.041 wt% for Si-Mn type wire and 0.026 wt% for Si-Mn-Ti type wire.

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Influence of Gas Metal Arc Welding Parameters on the Bead Properties in Automatic Cladding

  • TERNER, Mathieu;BAYARSAIKHAN, Tsend-Ayush;HONG, Hyun-Uk;LEE, Je-Hyun
    • Journal of Welding and Joining
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    • v.35 no.1
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    • pp.16-25
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    • 2017
  • Gas Metal Arc Welding is a widely used process in Industry due to its high productivity and potential to automation. The present study investigates the effects of the welding speed, arc voltage, welding current and shielding gas on the bead geometry for a low-carbon steel. The Response Surface Methodology (RSM) is used to choose an experimental design and perform test runs accordingly in order to produce mathematical models predicting the geometry, the hardness and the heat input of the bead as functions of the welding parameters. The direct and interaction effects of the four welding parameters are represented graphically and allow to determine an optimum set of welding parameters.

Effect of Flux Type on Arc Characteristic of FCA Welding (FCA 용접의 아크현상에 미치는 Flux Type의 영향)

  • 강성원;오은식;유덕상;안영호
    • Journal of Welding and Joining
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    • v.17 no.1
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    • pp.116-123
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    • 1999
  • The $CO_2$ welding with 100% $CO_2$ shielding gas is commonly used because of its cost and efficiency. Arc phenomena of the $CO_2$ welding is influenced by various factors such as chemical compositions of welding wire, shielding gas, welding condition and welding power source etc. In this study, arc phenomena is investigated by using two type of FCW(titania type, semi-metal type). Then, the welding quality and optimum welding condition can be selected. From this study, the following results were obtained; 1) In low current range(140A), FCW up to welding voltage(22V) resulted in a typical short circuit transfer. 2) In high current range(320A), the arc stability in titania FCW of a typical globular transfer is better than that of semi-metal FCW.

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