Physical and mechanical properties. The scope of solid solder.
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General characteristics of solid solders, Copper-based solders
Hard solders melt at temperatures that exceed 200… 250 0 С. They are divided into two groups — solders, which contain zinc, and solders that contain silver.
In the solders of the first group, in addition to zinc, copper also enters. The operating properties of such solders are determined by the percentage content of these metals. With an increase in the proportion of copper in the solder, its melting point increases. Accordingly, as the percentage of zinc in the alloy increases, its melting point decreases. As additives, copper-zinc solders also contain iron and lead, and their quantity can not be higher than 1.5%. Lead increases the fusibility of the solder, and changes its color: the alloy becomes lighter.
The production of copper-zinc solders is carried out in accordance with the technical specifications of GOST 1534−42. Preference was given to copper-zinc solders of three grades: PMC-36, PMC-48 and PMC-54 (the decoding of the designation: P-solder, M-copper, Z-zinc, the figure after the combination of letters-the percentage of copper in the solder). The state of supply of copper-zinc solders is a grain of 0.2 to 5 mm in size. For this parameter solders are divided into two classes: class A contains grains with transverse dimensions up to 3 mm, and class B — in sizes 3… 5 mm.
Copper-zinc solders are not used for soldering parts that, during their operation, experience increased internal pressures. This is due to the fact that during its solidification zinc evaporates from the copper-zinc solders, which is accompanied by intense pore formation. This degrades the quality of the solder joint, so in such situations only copper brazing is used. The same compositions are also used for the strong joining of parts and blanks from steel. The state of supply of copper solders — wire, or tape.
The company Elektrovek-steel offers to purchase at an affordable price a variety of solid solders. The supplier provides guaranteed delivery of products to the address specified by the consumer.
General characteristics of solid solders, Silver solders
Silver solders are distinguished by the presence of silver in place of lead. This negatively affects the cost of alloys, but it ensures the satisfactory functioning of brazed joints with such an alloy at much higher temperatures. The melting point of such solders increases with increasing percentage of silver in the alloy. The compound is durable, and not corroded. Silver solders are also used in those cases where it is required to provide a lighter color of soldered products.
The production of silver-containing solders is made in accordance with the technical requirements of GOST 8190−56. Such solders make grades from PSr2 to PSr72 (the letters Cp in the name indicate the presence of silver, and the figure at the end of the designation indicates the percentage of silver in the alloy). The chemical composition of silver-containing brazing alloys can also include cadmium (K) and phosphorus (F). Such solders melt at temperatures of 270… 850 ° С, the delivery condition — strips, bars and wire.
Buy solder solders at prices from the manufacturer offers the company Elektrovek-steel. The supplier guarantees prompt delivery of products to the address specified by the customer.