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Relevance

Special adhesive compositions are mainly used for the temporary joining of aluminum products, mainly pipes. They can not withstand considerable operational loads, and are used when there is no possibility to perform cold welding in production conditions. Two component adhesives for cold welding include epoxy resins and steel powder added as a filler.

Sequence of Operations

• The epoxy component is kneaded to a pasty state (this must take place at a positive ambient temperature);
• When the resin becomes a highly viscous paste, a certain amount of solvent is added to it, and the mixture is thoroughly mixed;
• The prepared composition is immediately applied to the joints of the aluminum products to be joined, which are then pressed tightly together;
• After some time, the mixture will polymerize, which can be detected by a change in its color. Then the pressure on the joint can be released and the construction can be used for its intended purpose.

Supplier Evek GmbH offers to buy aluminum of domestic and foreign production at an affordable price in a wide range. We provide product delivery anywhere in the continent. The price is optimal.

Cold plastic welding of aluminum parts

In this case requires the use of special deforming equipment - presses, but the quality of the connection by its mechanical characteristics is not inferior to the original metal, and in some cases even surpasses it. Plastic cold welding can be performed only in relation to the deformable aluminum and its alloys.

Cold riveting

Components to be joined have technological holes into which special rivets (hollow or solid) made of a wrought aluminum alloy or pure aluminum are inserted. Then, using special devices, the rivets are deposited. The metal fills the gaps under pressure to form a secure fastening; the strength of the joint corresponds to the shear strength of the rivet:

Cold upsetting/seating.

This "welding" can be done for flat surfaces as well as for joints. In the first case, cone-shaped punches are extruded from opposite sides with protrusions, which are then subjected to upsetting on hydraulic presses. The cold welding point is held under pressure for a few seconds to overcome the plastic inertia of the metal. At butt cold welding the ends are placed in the matrixes with a protrusion of 2...4 mm, and then they are tightly pressed under the hydraulic press slide. In this case, the joint is further strengthened due to the plastic deformation of aluminum.

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