열처리된 A3003 알루미늄합금 용접부의 미세조직 및 기계적 특성 |
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Microstructure and Mechanical Properties of A3003 Aluminium Alloy Welds by Heat-treatment |
Il-Cheon Lee, Yeong-Jong Song, Jin-Seon Gook, Dong-Joo Yoon, Byung-Il Kim |
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Abstract |
The present work was aimed to examine the variation of microstructure and mechanical properties by annealing(100~620℃, 2~8hr) in A3003 Al alloy welded pipes. The A3003 Al alloy pipes with 34 mm in external diameter and 1.3 mm in thickness were manufactured by high frequency induction welding with the V shaped convergence angle 6.7° and power input 50 kW. The tensile and yield strength decreased with increasing the annealing temperature remarkably, but elongation increased remarkably. Vickers hardness in welds decreased with increasing the annealing temperature remarkably. The primary intermetallic compound of Al₁₂(Fe, Mn)₂Si was precipitated in welds as the same base metal. In a certain experimental condition, the welds line in A3003 alloys disappeared at 450℃ for 2 hr because of the same mechanical property and structure between welds and base metal. |
Key Words:
A3003 Al alloy, High frequency induction welding, Annealing, Intermetallic compound, Al₁₂(Fe, Mn)₂Si |
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