• Journal of Welding and Joining
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• 제16권5호
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• pp.11-19
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• 1998

• Journal of Welding and Joining
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• 제16권5호
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• pp.30-38
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• 1998

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 1998년도 특별강연 및 춘계학술발표 개요집
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• pp.105-107
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• 1998

• Journal of Welding and Joining
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• 제21권5호
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• pp.500-508
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• 2003

• Journal of Welding and Joining
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• 제20권4호
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• pp.437-442
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• 2002

• Journal of Welding and Joining
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• 제12권3호
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• pp.56-62
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• 1994

The spot weldability of high strength steel sheet and two stories galvannealed high strength steel sheet has been studied. 1) Tensile shear strength decreased inversely as welding current increased over 12KA in the case of two stories galvannealed high strength steel sheet. 2) When heat flux input over 12KA, hardening region become narrow in case of two stories galvannealed high strength steel sheet. 3) The size of hardening region affect the strength of nuggets.

• Journal of Welding and Joining
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• 제32권4호
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• pp.20-25
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• 2014

Laser heat source was applied on 3D poly urethane model built by 3D printer and cellulous acetate for joining. A diode laser with 808nm wavelength was transmitted through the 3D model and applied on the boundary of ABS/Acetate and 3D poly urethane model. Based on the experimental result, the ABS and 3D built poly-urethane polymers was successfully joined, but the mechanical strength was not enough at the joining boundaries in the range of 6watt to 8watt of laser heat source. However, biodegradable acetate was successfully joined without damaging the 3D built model and mechanical strength was properly achieved. The optimum laser power was found between 5watt and 8watt with scanning speed of 500mm/min, 700mm/min and 1,000mm/min. Based on the SEM analysis the filling mechanism was that the applied pressure on 3D built model squeezed the fluidic thermoplastics, ABS and acetate, into the structure of 3D model. Therefore soundness of joining was strongly depending on the viscosity of thermoplastics in polymers. The developed laser process is expected to increase productivity and minimize the cost for the final products.

• 대한기계학회논문집A
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• 제38권5호
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• pp.483-487
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• 2014

SiC/SiC복합재료는 뛰어난 고온특성, 내산화성 및 크립(Creep)에 대한 저항성이 우수하고 또한 중성자에 의한 조사 손상이 다른 세라믹스에 비해서 적게 받는다는 장점으로 인하여 핵융합로의 블랑켓(Blanket), 제1벽(First-wall) 및 다이버터(Di-vertor)등의 후보재료로 적용이 기대되고 있다. SiC/SiC복합재료 제조시 가장 큰 문제점은 높은 소결온도와 압력으로 인하여 탄화규소 섬유가 손상되어 복합재료의 특성이 저하되는 것이므로 이들 재료의 전단강도 특성 평가는 매우 중요하다, 본 연구에서는 SiC제조특성과 소결온도에 대한 전단강도 특성의 평가한다.

• Journal of Welding and Joining
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• 제13권2호
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• pp.106-114
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• 1995

The characteristics of adhesive bonded joint of steels for automobile were investigated. Shear and tear strength were tested and analyzed for the joints of cold rolled steel sheets bonded with three kinds of epoxy and urethane based adhesive. The results showed that the tensile shear strength and the tear strength of adhesive joint were affected by the shape of adhesive joint such as the length and width of adhesive joint. The thickness of adhesive layer was very important factor affecting the bonding strength. The shear strength increased with decrease of the thickness of adhesive layer, while the tear strength decreased as the thickness of adhesive layer decreased. In comparison with the strength of spot welded joint, the shear strength of adhesive Joint was higher than that of spot welded joint, but the tear strength of adhesive Joint was lower than that of spot welded joint.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2003년도 추계학술발표대회 개요집
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• pp.86-88
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• 2003

The characteristic of induction heating solder bump(solder ball: Sn-37Pb, Sn-3.5Ag, Sn-3.0Ag-0.5Cu) has analyzed in this paper. The initial condition of induction heating depends on the time and current. The shape of lead-free solder bump is better than lead solder. The shear strength of lead solder bump has decreased with aging time. The average of shear strength of solder bump is about 10N, 11N, and 11N respectively. The lead-free solder bump's shear strength is better than lead solder and varies irregularly with aging time.