In some high-powered construction machinery, often use the two and a half pieces of copper from the solder into the copper bearing bush, but after the machining of the welding process, often occur due to copper-bearing welded joints is not strong split severely affects the quality of parts, sometimes even scrapped.

In the past, we in the welding of copper bearing, usually the first use of oxyacetylene flame to warm up (warm-up method that is not evenly heated parts), then a certain power of the soldering iron and solder the two copper-bearing (usually ZQSn6-6 -3) Welding Electrodes, but often occur as a result of copper-bearing joints cracking the case of processed scrap pieces.

To this end, we have access to relevant information, through trial and error, finally found an ideal welding methods, are presented below.

As the thermal conductivity of copper and heat capacity are larger, so the welding heat input should be bigger. To this end the need for soldering copper bearing before preheating process, which uses a 2-4kw electric oven, the temperature adjusted to 150 persons 5 ℃, will be a number of semi-welded sheet of copper bearing on the oven, bake 3-4h, and then removed for welding, but it must seize the time, to prevent excessive cooling parts. Atlas air compressor accessories welding procedures:

(1) with dilute sulfuric acid or hydrochloric acid in a two and a half pieces of copper-bearing joints painted wash 1-2 times more dirt for a long time to be painted several times, until the oil and impurities, in addition to the net so far. The surface roughness of joints should be Ra3.2μm.

(2) with a certain power of the electric iron (depending on part size) to solder (or solder, rosin) evenly on the two joints on the tin layer thickness are 0.05mm or so.

(3) in the tin layer above a thin layer evenly coated with paraffin wax (stearic acid).

(4) quickly to two copper bush together, and with pincers or a special tool grip, and push back and forth several times along the vertical, the bottom two stickers bearing bond and accurate service.

(5) Since the linear expansion coefficient of copper bearing a larger contraction in the cooling rate is high, the weld immediately after Aluminium Welding Electrode  pieces gently tap to grain refinement, reducing the residual deformation, welding surface to prevent cracking.

(6) to be welded completely cooled, you can be machined.