• 제목/요약/키워드: Optimum welding condition

검색결과 142건 처리시간 0.024초

EVALUATION OF FRICTION WELDABILITY OF TYPE 5052 ALALLOY/LOW CARBON STEEL JOINT.

  • Kim, Kyung-Kyun;Lee, Won-Bae;Yeon, Yun-Mo;Kim, Dae-Up;Jung, Seung-Boo
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 2002년도 Proceedings of the International Welding/Joining Conference-Korea
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    • pp.528-533
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    • 2002
  • The mechanical and metallurgical properties of friction welded joints type 5052 Al alloy/A36 steel have been studied in this paper. The joint strength increased with increasing upset pressure and friction time till it reached the critical value. The joint strength was fixed at low strength compare to that of base metal in the case of increasing friction time. Microstructure of 5052 Al alloy was greatly deformed near the weld interface. The very fine and equaxied grain structure was observed at the near interface. The elongated grain was formed outside dynamic recrystallizatoin region at the peripheral part, while the A36 steel' side was not deformed. The hardness of the near interface was slightly softer than that of 5052 Al alloy base metal. The maximum softening width was about 8mm from the interface. In the present work, the friction welding condition, t$_1$=0.5sec, P$_2$=137.5MPa, showed a maximum joint strength (202MPa) when friction pressure, upset time and rotation speed were fixed at 75MPa, 5sec, 2000rev/min and these were the optimum friction welding condition of 5052Al/A36 steel joints.

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박판재 용접 구조물의 선상 가열 교정에서 최적 조건의 선정에 관한 연구 (A Study on the Optimum Line Heating Condition for Straightening a Thin Plate Welded Structure)

  • 박준형;김재웅
    • Journal of Welding and Joining
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    • 제29권2호
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    • pp.40-45
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    • 2011
  • The purpose of this study is to establish the optimum line heating condition to straighten the excessive bending distortion of a thin plate welded structure. For it, the extensive FEA and experiments were performed to evaluate the effect of heat source, heating speed and position on the straightening of a thin plate welded structure. In accordance with the results obtained by FEA and experiments, the straightening effect of line heating was strongly depends on the variables used in this study. With the results, the optimum line heating condition was established by using the response surface method and verified through comparing it with the numerical analysis result.

아아크 용접시 입열 조건의 최적화에 관한 연구 (Optimization of the Heat Input Condition on Arc Welding)

  • 박일철;박경진;엄기원
    • Journal of Welding and Joining
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    • 제10권2호
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    • pp.32-42
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    • 1992
  • A method of optimization of process parameters in Arc Welding has been discussed in this paper. The method of investigation is based on the numerical calculation of weld bead by a finite element method and non-linear optimization technique is applied to estimated the optimization process parameters from the numerical calculation. The common package program(ANSYS 4.4A) was used to obtain the process parameters for a thin plate arc welding (TIG, CO$_{2}$). The results on some test are satisfactory and the used method of this paper is a useful guide to the optimum welding condition.

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용접구조물의 안전시공을 위한 현장기술과 용접기술 동향 (Field Welding Technology for Safe Manufacture of Welding Structure & Recent trend of Welding Technology)

  • 유택인
    • 기술사
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    • 제34권2호
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    • pp.37-41
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    • 2001
  • In recent days, welding technology developed in various field of industry, a ship, a building, a structure, a high pressure vessel ect. A welding structure should be base on a safety Welding engineers and welding technicians have a problem in acquiring welding technology, because young people avoid state of the art, beginning their careers In this field. The optimum welding state depends upon the most welding condition, mechanical properties of the base metal, welding processes and arc stability. Base on these fact, the suitable parameters of welding condition can be found through various welding experiments. Therefore, it Is very Important for welding professional engineers to take an active role In advancing new welding technology

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Al 6061 합금의 마찰교반용접 시 접합변수가 강도에 미치는 영향 (The Effects of Joining Factors on Strength of Al 6061 Alloy in FSW)

  • 강대민;이대열;박경도
    • 동력기계공학회지
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    • 제21권5호
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    • pp.86-91
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    • 2017
  • Friction Stir Welding (FSW) is useful technique to join aluminum alloy with energy efficient and environment friendly. In this paper, the design of experiment with three-way factorial design was adopted for optimum conditions of welding variables in the FSW of Al 6061 alloy. Tools of shoulder diameter of 9, 12, 15 mm and pin length of 1.5 mm were used. Also the material's dimension for welding were $2{\times}100{\times}150mm$, and the tensile specimens were worked by water-jet technique. Welding variables were shoulder diameter, rotating speed and travel speed of tool. From the results of this work, the welding factor influenced on yield strength most was travel speed and the optimum condition for FSW was predicted as the shoulder diameter of 15 mm, welding speed of 500 mm/min and rotating speed of 2,000 rpm. Also the presumption range of yield strength at optimal condition of reliability 99% was estimated to $207.19{\pm}9.91MPa$.

TMCP강의 습식수중 아크 용접성에 관한 고찰 (A study on the weldability of TMCP steel plates in underwater wet arc welding)

  • 오세규;김민남
    • Journal of Welding and Joining
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    • 제5권4호
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    • pp.28-35
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    • 1987
  • The feasibility of underwater wet arc welding process is experimentally investigated by using high titanium oxide type electrodes and TMCP steel plates as base metal. It is assertained the tis process may be put to practical use. Main results are summarized as follows; (1) Sound underwater weld can be obtained by skilled welding operator, if proper welding conditions are selected. (2) In underwater wet arc welding process, the mechanical properties of HAZ are depend upon welding condition and the optimum welding condition can obtained. (3) The maximum hardness in the HAZ of TMCP steel plates is increased significantly in this welding process.

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5456-H116 합금에 대한 마찰교반 용접과 마찰교반 프로세싱에 관한 연구 (Investigation on friction stir welding and friction stir processing for 5456-H116)

  • 김성종;박재철
    • 한국표면공학회:학술대회논문집
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    • 한국표면공학회 2009년도 춘계학술대회 논문집
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    • pp.242-243
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    • 2009
  • Friction stir welding and friction stir processing is a new solid state processing technique for ioining and micro..structural modification in metallic materials. It has been applied not only joining for light metals but also modification of the microstructure to enhance mechanical properties. In thin study, we investigated the mechanical properties for applied friction stir welding and processing under various parameters such as probe diameter, probe type, traveling speed and rotating speed for 5456-H116 AI allov. As a result of experiments, optimum condition of friction stir welding is traveling speed of 15mm/min, rotating speed of 500RPM at 6mm diameter probe. Moreover, in the case of friction stir processing, the optimum condition is traveling speed of 15mm/min, rotating speed of 250RPM at full screw probe. As above mentioned, the mechanical characteristics enhanced with the decreasing of traveling speed and the increasing of friction areas because of plastic flow due to high friction heat. These result can be used as reference data for ship repairment.

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

  • 강성원;오은식;유덕상;안영호
    • Journal of Welding and Joining
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    • 제17권1호
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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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$CO_2$ 용접의 스패터 발생에 미치는 용적이행 모드의 영향 (Effect of Metal Transfer Mode on Spatter Generation of $CO_2$ Welding)

  • 강봉용;김희진
    • Journal of Welding and Joining
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    • 제15권2호
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    • pp.72-80
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    • 1997
  • The spatter generation rate of GMA welding with $CO_2$ gas shielding was measured with the change of welding conditions such as wire feeding rate and welding voltage and then the results were analized with the accompanying changes in metal transfer mode and in bead geometry. The spatter generation rate (SGR) was relatively low not only wit the short circuit transfer but with the truely globular transfer mode. However, the SGR resulted with the mixed mode were consistantly high. The resultant wave pattern of mixed mode was due to the coexistance of short-circuit and globular transfer and characterized by the frequent appearance of instantaneous short circuit. Considering the result of SGR and that of bead geometry, it could be concluded that when the wire feeding rate (or welding current) was either low or high, the optimum bead shape could be obtained along with the low spatter generation. However, in the middle range of wire feeding rate, the optimum bead shape was only obtained in the mixed mode condition resulting in the high spatter generation.

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