Abstract
Cold metal transfer welding/brazing of AA5754 aluminum alloy and Q235 low carbon steel was performed in a lap joint configuration using an AlSi12 filler wire. The effect of heat input on intermetallic compounds (IMC) formations and mechanical properties has been investigated. At a low heat input of 157 J/mm, a layer of IMC, with a composition of Al7.2Fe1.8Si was generated at the fusion zone/steel interface. Low interfacial energy and good interfacial bonding between fusion zone and Al7.2Fe1.8Si led increased joint strength. An additional Fe(Al,Si)3 IMC formed at the interface in conjunction to Al7.2Fe1.8Si at a high heat input of 201 J/mm. The joint strength was significantly decreased and attributed to a high interfacial energy and poor interfacial bonding between Al7.2Fe1.8Si and Fe(Al,Si)3. The results showed that the interfacial energy at interphase boundaries had remarkable effect on the joint strength.
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