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정재필 서울시립대학교 산업기술연구소 1999 산업기술연구소논문집 Vol.7 No.-
The importance of liquid metal motion in weld pool which gives considerable effects on the weld pool penetration shape has been recognized. In this study, AIS1304L stainless steels which have different sulphur contents as 90ppm and 120ppm were welded by GTAW(Gas Tungsten Arc Welding)process. Penetration shapes of the welded beads and 'penetration depth(P)/Bead width(W)'ratios were investigated. Experimental results showed that the bead width increased nearly 5% and P/W ratio about 70% when S content increased from 90ppm to 120ppm. The bead width and penetration depth increased proportionally to the current in the range of the current over 210A for 2.4mm tungsten electrode diameter and over 300A for 3.2mm diameter.
정재필 서울시립대학교 산업기술연구소 1997 산업기술연구소논문집 Vol.5 No.-
Effects of gas formers of MgCO3, CaCO3 and Li2CO3 on the spattering phenomena was investigated for non-shielded flux cored arc welding. Spattering Phenomena were pictured using high speed camera at a 3000 frames per sec. As experimental results, spattering modes were classified into 4 types. The modes were spattering by arc force, gas explosion short circuit and pore escape. The amount of spatters by arc force was 30%, gas blowing force was 40%, short circuit 10%, Pore escape was 10% and others were 10%. When Li2CO3 was added, the amount of spatters was largest and it decreased in the order of CaCO3 and MgCO3.
강춘식,정재필 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.10
The mechanisms of the liquid metal formation at Ni/B/Ni (Ni: base metal, B: insert material) joint, which could be characterized as liquid phase diffusion bonding, has been investigated. Fine boron (B) powders (under 300 mesh) were coated on the elaborately polished bonding surfaces as an insert material. The specimen packed in quartz tube under 5×10^(-3) torr vacuum was heated in a induction furnace to 1283K-1473K. It is observed that inserted material B was diffused into base metal, and that liquid metal was formed by the reaction of B and Ni. Liquid metal was formed preferentially at the grain boundaries. The state of phases was analyzed to depend on B content because of the fact that content of B on the liquid layer was higher than the solid state base metal.
B 를 삽입재로 사용한 STS 304 강의 등온응고확산접합
강춘식,정재필,이충도 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.3
A new diffusion bonding method (named as Melting Induced Diffusion(MID) bonding) which aimed to make better Transient Liquid Phase(TLP) bonding was developed and applied to the bonding of 304/304 stainless steel. In this research boron powder was used as a insert metal. The width of reacted layer of the bonded joint had linear relationship with square root of bonding time. And the bonded ratio of the joint increased with bonding time. As a result of tension test, tensile strength far room temperature were about 200㎫.