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OPTIMISATION OF THE TECHNOLOGICAL PARAMETERS OF COLD PRESSURE WELDING THIN SHEETS OF AD1M ALUMINIUM.
Abstract
In cold pressure welding thin sheets of AD1M aluminum with a thickness of 0. 3, 0. 5, 0. 7, and 0. 8 mm, the length of the welding zone is controlled by thee angle of the punch. The length of the welding zone increases with a reduction of this angle. In the examined range of the angles of the punch, the optimum angle is 7 degree . The increase of the extent of friction of the contact surface increases the length of the welding zone. The strength of this effect increases with a reduction in angle of the punch and an increase of thickness of the material. The quality of welding is influenced by the thickness of the welded material.
... Bay [3] examined the bonding mechanism of cold pressure welding and mechanisms producing metallic bonds in cold welding [4]. Tabata et al. [5] [22]. In the present paper, aluminium and copper sheets were joined by cold pressure welding, namely, lap welding. ...
Cold pressure welding is a special welding method that has been used in applications such as assembly of various parts at an increasing rate in recent years. In the present paper, cold pressure welding was applied to commercial purity aluminium and copper sheets as lap welding and a 150 metric ton hydraulic press was used for the process. As the surface roughness and the weld deformation ratia of aluminium sheets increased, tensile strength of the joints also increased. Purchased specimens with original roughness had the lowest weld deformation as-is and it was not possible to join these sheets at 30% weld deformations. Fatigue tests showed that joined sheets resisted against low fluctuating tensile stresses. Hardness increases due to local hardening at the interface as a result of cold deformation. Also EDX (Energy Dispersive X-ray) measurements clearly show that Al-Cu joints contain an intermetallic compound layer at the interface which does not affect the joint strength to a great extent. Results showed that the cold pressure welding technique in lap form resulted in strong Al-Al joints and the intermetallic layer formed in Al-Cu joints did not affect the joint strength to a great extent.
Cold pressure welding is a special welding method used in applications such as assembly of various parts at an increasing rate in recent years. In the present study, cold pressure welding was applied to commercial purity aluminium and copper sheets as lap welding and a 150 metric ton hydraulic press. As the surface roughness and the weld deformation ratios of aluminium sheets increased, tensile strength of the joints also increased. Purchased specimens with original roughness had the lowest weld deformation as-is and it was not possible to join these sheets at 30% weld deformations. Fatigue tests showed that joined sheets resisted against low fluctuating tensile stresses. Hardness increases due to local hardening at the interface as a result of cold deformation. Results showed that the cold pressure welding technique in lap form resulted in strong Al-Al joints and the intermetallic layer formed in Al-Cu joints did not affect the joint strength to a great extent.
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