vacuum brazing

1612月 2018

All kinds of brazing joints formed by ceramic metallization, because of the existence of coating or coating, restrict the use of ceramic components at high temperature. It is difficult to give full play to the superiority of high temperature stability of ceramics. It requires people to find a direct brazing method.

Direct brazing of ceramics can solve the problem of connection of parts that can not be metallized completely because of blind hole or geometric dimension factors. It can greatly simplify the brazing process and meet the requirements of high temperature use of ceramic components. This method uses brazing fillers containing Ti or Zr active elements to braze ceramics directly with metals, ceramics and ceramics, ceramics and graphite.

1612月 2018

The development of control system for large vacuum aluminium brazing furnace is introduced. The main functions of the control system are temperature control and logical control, which require a large number of control points, and each controlled object is related to each other. The core of the control system is programmable logic controller.

The method of CX-Programmer software programming is used to control and set up various protection functions for each mechanical system. The programmable controller has the advantages of flexibility, convenience and easy maintenance.

1312月 2018

When vacuum welding cemented carbide tools, uniform heating of tool rod and cemented carbide sheet is one of the basic conditions to ensure the welding quality. If the heating temperature of the cemented carbide sheet is higher than that of the tool rod, the strength of the joint will decrease if the melted filler metal wets the cemented carbide sheet instead of the tool rod. When the alloy sheet is sheared along the welding layer, the solder will not be destroyed, but will be detached with the alloy sheet. The milling marks on the support surface of the tool rod can also be seen on the welding layer. If the heating speed is too fast and the temperature of the tool rod is higher than that of the alloy sheet, the opposite phenomenon will occur.

1212月 2018

Sandblasting treatment of cemented carbide. Without sandblasting equipment, the cemented carbide can be held by hand, and the oxide layer on the brazing surface and the Black Brand letters can be ground on the rotating green silicon carbide grinding wheel. If the oxide layer on the brazing surface of cemented carbide is not removed, the filler metal is not easy to wet the cemented carbide. Experience has proved that if there is oxide layer or black brand letters on the brazing surface, sandblasting treatment should be carried out. Otherwise, the brazing filler metal is not easy to wet the cemented carbide, and obvious black letters still appear in the brazing seam, which reduces the brazing area and causes the phenomenon of de-welding.

1212月 2018

The function of brazing flux is to reduce the oxides on the tool rod and the surface of cemented carbide, so that the brazing metal can be well wetted. Generally, the melting point of filler metal is lower than that of the filler metal above 100 C, and it has better fluidity and lower viscosity. The flux melted in the brazing heating process can protect the brazing filler metal and the brazing surface, at the same time, it can reduce the oxide.

The main requirements for cemented carbide solders are as follows.

(1) The brazing filler metal should have good wettability to the brazed cemented carbide and steel matrix to ensure that the filler metal has good fluidity and permeability.

1212月 2018

Brazing fillers for cemented carbide and steel can be divided into three categories according to melting point and brazing temperature: high temperature filler metal, normal temperature filler metal and low temperature filler metal.

Brazing temperature above 1000 °C is called high temperature brazing filler metal, such as copper and 106 brazing filler metal; brazing temperature of medium temperature brazing filler metal is between 850 and 1000 °C, such as H62 and H68 brass filler metal; low temperature brazing filler metal refers to brazing temperature between 650 and 850 °C, such as B-Ag-1 and L-Ag-49 silver-containing filler metal.

0612月 2018

Vacuum Brazing Technology

Generally, vacuum brazing adopts stage heating mode to ensure uniform heating of workpiece. The technological parameters of vacuum brazing are as follows: setting temperature 620 C, holding 15 min-30 min, vacuum degree 3 x 10-3 PA and heating rate 10 C/min in the brazing temperature control meter. In the initial cooling stage, the brazing temperature is controlled at 10 C/min, ending at 450 C, and then cooling to room temperature with the furnace.

0512月 2018

Before 380 C, it can be heated at a faster speed, usually 20 C/min, and at 380 C, it should be kept for 60-90 min.

It can increase the vacuum requirement to 8. The heating rate should not be too fast in the range of 470 520 C, generally controlled at 10 15 C/min.

The temperature of the workpiece should be close to 510 C and the vacuum should be 6.5 *10-3. At 570 °C, the workpiece should be kept for 60-90 minutes.

The temperature difference between the surface and the center of the workpiece is reduced to 5.0*10-3 (up to 560 C) and the vacuum is reduced to 5.0*10-3.

0512月 2018
vacuum heat treatment furnace

The structure of aluminium vacuum brazing furnace should be advanced and reasonable. The heating elements should be uniformly arranged along the 360 degree circumference of the heating chamber, and the temperature uniformity is high. High power and high pumping speed vacuum unit should be adopted. The vacuum recovery time is short. Zonal temperature control, small workpiece deformation, high production efficiency. It has the advantages of low cost, stable and reliable mechanical action, simple operation and flexible input of programming technology. Manual/semi-automatic/automatic control, automatic alarm/display of faults. It can meet the requirements of vacuum brazing and quenching of the typical parts provided by users. The aluminium vacuum brazing furnace should have reliable automatic ……

0512月 2018

Sharp tools make good work! Product quality is always the basis of enterprise survival. We can not only provide customers with high quality and stable performance of vacuum furnace products, but also employ senior technicians with many years of experience in the use of vacuum furnace, which can provide users with good process support in the use of vacuum furnace. This Studio provides vacuum brazing process and technology to solve all kinds of abnormal problems in the production process. It can help users to improve the qualified rate of products. Provide vacuum furnace and its spare parts.