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Properties of seam welds produced with different extrusion parameters

Bingöl S., Keskin M. S., Bozaci A.

Archives of Materials Science and Engineering

2007

Vol. 28, nr 6

365-368

Purpose: This study focuses to investigate the effects of different extrusion parameters on microstructural properties of seam (longitudinal) welds in aluminum extrusion profiles. Design/methodology/approach: To realize the study, it is studied on a hollow extrusion profile type which has seam weld zones. The experimental profile was produced in different temperatures, billet temperatures and ram speeds by a real extrusion press which has a capacity of 1460 tones. These parameters are some of the most important parameters in an extrusion process. Findings: Some structural differences are occurred between having the different extrusion parameters both seam welds and without weld regions, when the experimental results are observed. In addition, it was observed commonly the structure of the material had a change through recrystallization with increasing temperatures. This situation decreases the significance of seam weld lines. Moreover, the grain size is getting smaller with increasing ram speed as it is shown in microstructural figures. Research limitations/implications: Also some structural differences in seam welds may occur for having the other extrusion parameters without temperature and speed. But, the other extrusion parameters are not used in this study. Therefore, effect of some other important parameters such as pressure, extrusion ratio can be investigated in future. Practical implications: In application, seam welds occur on hollow profiles. This study demonstrates that some extrusion parameters effect to microstructure of seam welds. Originality/value: It is shown that different microstructural properties take place due to the process parameters variations and natural of extrusion method in the extrusion production. They cause also variations on structural features.