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Effects of gap width and Groove on the Mechanical Properties of Butt Joint Between Aluminum Alloy and Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2013年第2期26卷 143-148页

作者： Honggang DONG Chuanqing LIAO School of Materials Science and Engineering Dalian University of Technology Shanghai Aerospace Equipments manufacturer

Butt joining of 5A02 aluminum alloy to 304 stainless steel sheets was conducted using gas tungsten arc welding process with Al-12%Si （wt.%, the same below） and Zn-15%Al flux-cored filler wires. The effects of gap width and groove in steel side on the microstructure and tensile strength of the resultant joints were investigated. For the joint made with 0 mm-wide gap and without groove in steel side, severe incomplete brazing zone occurred along the steel side and bottom surfaces, and consequently seriously deteriorated the joint strength. However, presetting 1.5 mm-wide gap or with groove in steel side could promote the wetting of molten filler metal on the laying surfaces, and then significantly enhance the resultant joint strength. Moreover, post-weld heat treatment could further improve the tensile strength of the joints. During tensile testing, the specimens from the joints made with AI-12%Si flux-cored filler wire fractured through the weld or interracial layer, but those from the heat-treated joints made with Zn-15%AI flux-cored filler wire fractured in the aluminum base metal.

关键词： Aluminum Stainless steel Arc-brazing gap width Groove Mechanical property

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Effects of Butt Design and gap width on the Microstructure and Mechanical Properties of Magnesium Alloy Welds

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Journal of Materials Science & Technology 2012年第6期28卷 537-542页

作者： Honggang Dongi Chuanqing Liao Liqun Yang School of Materials Science and Engineering Dalian University of Technology Dalian 116085 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China

The effects of parallel and angular butt designs with different gap widths on the microstructure and mechanical properties of the resultant magnesium joints in gas tungsten arc welding were investigated. The experimental results displayed that the tensile strength of the joint made with angular butt joint and 0.3 ram-wide gap reached 266 MPa, the joint fractured through the heat-affected zone or base metal during tensile testing, and the microstructure examination showed that no macropore appeared in the fusion zone. However, macropores in diameter of larger than 200 micron occurred for other joint designs, the tensile strength of the resultant joints decreased, and the joints fractured through the fusion zone during tensile testing. The fracture surfaces were examined by scanning electron microscopy and the microhardness distribution in the joints was measured by using a Vickers microhardness tester.

关键词： Magnesium Gas tungsten arc welding Butt design gap width Pore Mechanicalproperties

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Effects of gap width and Groove on the Mechanical Properties of Butt Joint between Aluminum Alloy and Stainless Steel

Effects of Gap Width and Groove on the Mechanical Properties...

引用

The 2nd International Symposium on Computer-Aided Welding Engineering

作者： C.Q. Liao H.G. Dong School of Materials Science and Engineering Dalian University of Technology

Butt joining of 5A02 aluminum alloy to 304 stainless steel sheets was conducted using gas tungsten arc welding-brazing process with Al-12%Si and Zn-15%Al flux-cored filler wires. The effects of gap width and groove on steel side on the microstructure and tensile strength of the resultant joints were investigated. For the joint made with 0mm-wide gap and without groove on steel side, severe incomplete brazing zone occurred along the side and bottom surfaces of steel, and consequently seriously deteriorated the joint strength. However, presetting 1.5mm-wide gap or with groove on steel side could promote the wetting of molten filler metal on the faying surfaces, and then significantly enhance the joint strength. Moreover, post-weld heat treatment could further improve the tensile strength of the joints. During tensile testing, the specimens from the joints made with Al-12%Si flux-cored filler wire fractured through the weld or interfacial layer, but those from the heat-treated joints made with Zn-15%Al flux-cored filler wire fractured in the aluminum base metal.

关键词： Aluminum Steel Arc-brazing gap width Groove Mechanical property

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