[treatment skill] solder the full explanation of heat treatment

Before soldering, solder in the process, solder after be over, accuse to heat through holding, heat preservation, cooling parameter, solder in order to improve the technology of contact arrangement and function, call solder heat treatment. Solder heat treatment includes: Warm-up, postheat, solder postheat handles 3 kinds of heat treatment.

One, warm-up
The warm-up before solder is helpful for dropping solder tectonic cabined degree, drop welding stress, avoid to solder crackle; Be helpful for welding line hydrogen dispersing, avoid hydrogen to send crackle; Be helpful for reducing heat to affect the oil strong rate of the area, progress solders the crack resistance of contact.

Of warm-up temperature choose, close into positive with data Ceq, ply, become negative relevant connection with environmental temperature.

2, postheat
Postheat points to hydrogen treatment of the disappear after solder, point to solder break down (confused branch is be over surely) hind, welding line temperature did not drop before 100 ℃ , heat hour of 2~6 of 200~350 ℃ heat preservation, in order to quicken welding line and transgression of hydrogen of hot influence area. The width of postheat should not be less than warm-up width.

3, the heat treatment after solder
The heat treatment after solder is to point to solder after be over, heat weldment sure temperature, heat preservation is sure always, come down in order to need the cooling rate of model of established rule or practice cools, arrive improve solder contact metallographic arrangement and mechanical function, eliminate the technique of a kind of heat treatment of welding stress. Technology of the heat treatment after solder includes normalizing, anneal, temper, attune to wait character, apply the most extensive is temper.

Solder to drop cost, reduce solder labor intensity, progress solders power, everybody often expects to simplify as far as possible, abolish or partial abolish solder heat treatment. Accuse composition and metallurgy technology through holding for example, production goes out avoid warm-up to solder steel.

But, as the ceaseless progress that manages social estate of rolled steel intensity, rolled steel solderability drops, solder difficulty increases ceaselessly. Soldering when the steel that has older oil hard tendency, solder to assure contact quality, apply a standard to be carried out strictly by the data solder heat treatment, remain necessary way.

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