SU439358A1 - Welding paste - Google Patents

Description

The invention relates to the field of welding technology and can be used to control the thermal cycle during the welding process.

Lime welding paste containing heat-conducting metal powder (copper), low-melting metal powder (Wood's alloy) and a binder - dyed 1nlam.

Heat removal from the place of application of the paste occurs due to the high thermal conductivity of the metal powder, due to the melting of the low-melting metallic powder and as a result of the formation of a gaseous phase of water evaporation during the hot coating of the paste with the heated surface.

The use of heat sink, paste paste, reduces the heat-affected zone of the weld, the crystallization time of the welded ish, and the residence time of the heat-affected zone at elevated temperatures. The disadvantage of such a paste is the complexity of the grinding of the Wood alloy and the insufficient structure-mechanical characteristics.

The increase in heat dissipation w; the paste's ability and high structural and mechapic properties are ensured by the fact that expanded perlite sand is introduced into the paste at the following component ratio, wt. %:

35-38

Red mud Perlite sand (expanded) 5-7

Copper powderErest

The paste consists of heat-conducting metal powder (copper), a binder — red mud, which is a waste of npi; the production of alumina, in the composition of which t.chod t; weight. %:

RegOz-39-43; 5102-9.5-11; A1.0.-17-19; TiOz-4,4-5,6; CaO-7.6-9.5; PsOs-O.lS- -0.28; NasO-6,2-6,9; VaOj-0.25-0.27; other - the rest. The humidity of the paste ranges from 40-80% ;.

Heat removal from the welding point is carried out by heat-conducting copper powder and due to intensive evaporation of water. The expanded perlite sand is obtained by rapidly burning some acidic volcanic water-containing rocks npi; 950-11 ° C. The expanded perlite sand has a porous structure. For s.machivann 1 g of expanded perlite sand, it is necessary MO 3-4 g of water. Due to this structure in

The capillaries are formed through the paste, which facilitates the delivery of water to the surface of the product, as well as its delivery. The expanded perlite sand of the ogpestoek is chemically inert. no odor. The introduction of a small amount of swollen pearlite sand makes it easier to make a paste and provides directional drainage of water. The paste allows narrowing the zone of plastic flow of the material being welded and reducing temperature gradients from the welding point to the base material.

Subject invention

Welding paste, mainly for regulating the thermal cycle, containing copper powder and red mud, characterized in that, in order to increase the heat-retaining capacity of the paste, expanded perlite sand is introduced into its composition at the next ratio of componites, by weight. %:

Red Slime35-38

Perlitovy jesok

(expanded) 5-7

Copper powderErest