Effect of surface roughness on weldability in aluminium sheets joined by cold pressure welding
Küçük Resim Yok
Tarih
2008
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Emerald Group Publishing Limited
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Purpose - The purpose of this paper is to examine the effects of the welding deformation and surface roughness in cold pressure welding on the tensile strength and the fatigue strength of joined sheets. Additionally, the paper seeks to analyse the hardness variations and microstructures at the welding interface. Design/methodology/approach - Cold pressure welding is a method of joining similar or dissimilar ductile metals. it can be applied by bringing into close contact the surfaces of virgin metal specimens that appear due to the breakdown of the surface layers caused by bulk plastic deformation. Cold pressure welding is applied to test parts without too long a delay after the preparation of surfaces. The application of welding in 10 min affects importantly the weld strength. As this time is increased, the weld strength of the joints is decreased. The determination of deformation amount is found by determination of the reduction (R) at the total thickness of the two parts after the welding process. Findings - The weld strength increases as the surface roughness and weld deformation of the joined sheets increase. The length of bond zones increases with increasing deformation. Therefore, the weld strength of parts depends on the length of bond zones. Then, there is an effect of surface roughness on the welding strength. Joined sheets show resistance to little fluctuating tensile stress. It is observed that the parts rupture from the welding-interface hardness values are about the same at interfaces of sheets having different surface roughness and equal deformation (60 per cent). But, if it is considered that hardness of aluminium material purchased is about 53 HV, it can be said that the hardness increases in joined parts because of local hardening during deformation in cold pressure welding method as lap welding. Bond formation at interfaces of joined sheets having R-a = 5 mu m surface roughness and deformation ratio 60 per cent is shown to be successful in the microstructure photo. Research limitations/implications - Surface roughness and deformation values can be increased in further studies. Originality/value - The paper offers insight into the effects of surface roughness on weldability.
Açıklama
Anahtar Kelimeler
Welding, Cold Welding, Tensile Strength, Copper, Steel, State
Kaynak
Industrial Lubrication And Tribology
WoS Q Değeri
Q4
Scopus Q Değeri
Q3
Cilt
60
Sayı
5
