Uniformity. At the same time, the brazing holding time should be appropriate. Tests have shown that if the holding time is too short, the capillary suction force of the plasma arc cutting electrode assembly is not completely filled with the capillary suction end, causing the overall temperature at the joint to drop, and even causing the phenomenon of desoldering. Affect the quality of brazing directly. On the other hand, if the time is too long, it may cause the molten silver liquid to evaporate, which also affects the quality of brazing. The test shows that the timely insulation, the weld, the welding layer is uniform, both the shell quality, or the internal quality are quite satisfactory.

(7) Cooling Since the vacuum silver brazing temperature is above the melting point of the silver-copper alloy solder and it is kept warm at a proper time, the silver-copper alloy melted at this time has a certain fluidity. In the experiment, we first pre-cooled the components below the melting point of the solder, and then quickly cooled the N2 gas to ensure that the components are in a good position to obtain satisfactory brazing quality.

Conclusion () CNC vacuum arc cutting electrodes after vacuum brazing, the surface quality is good, no oxidation, bright color, uniform and dense weld, and the quality is stable, the product pass rate of more than 98% (metallographic picture see below).

(2) The CNC plasma arc cutting electrode is used in a good condition after vacuum brazing. Imported plasma arc cutting electrode using cutting distance (on the next page 30) By using AQ251 quenching liquid, Cylinder cap bolt inspection pass rate has been greatly improved to solve the production problems, plus the reliability of the whole product. Now we will randomly select the inspection of 6 furnaces. Table 2 Mechanical properties of the cylinder head bolts after quenching with AQ251 quenching solution Performance index Hardness quality furnace evaluation First furnace Qualified second furnace Qualified third furnace Qualified fourth furnace Qualified fifth furnace Qualified qualified value of qualified sixth furnace After a period of use, we believe that this AQ251 quenching agent has the following remarkable features: plasma arc cutting electrode brazed assembly weld metallographic picture separation is 300m, and the use of vacuum silver brazing cutting The distance is more than 500m. Currently, it has been promoted and applied in some domestic key enterprises. It is gradually replacing imports and has been widely praised.

The quenching fluids have better quenching uniformity than the two quenching fluids, and are insensitive to the original structure. This reduces batch rework and rejects, and allows the product to meet a 98% or more pass rate.

From the perspective of the use of cylinder head bolts, the early failure of bolts (such as bolt breakage or fatigue, etc.) is reduced.

From the situation on the site, the working environment was improved, the original fumes filled, and the condition of the oil stain on the ground was fundamentally improved. (20040518)

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