Many beginners, faced with diffusion bonding in press of non-ferrous metals, decide to buy diffusion bonding, but when faced with a variety of colors, they have difficulty in choosing. This overview will help you understand the existing range and choose an option, taking into account the conditions of use.
Bonding of press billets is a laborious and responsible business that requires certain knowledge, skills and the use of modern equipment.
The complexity of the diffusion bonding in press process is influenced by two factors.
- A refractory film of its oxide instantly forms on the surface of active diffusion bonding in press
- The material has a high thermal conductivity at a low melting point
- Bonding press with a semi-automatic machine can lead to a change in the geometry of the parts
Before carrying out work, the work pieces must be prepared in a special way.
- Firstly, the film from the metal surface is easy to remove mechanically and chemically using a file, a grinder or fluxes. The surface is treated in the area of the joint.
- Secondly, semi-automatic bonding of press assumes the presence of high temperatures in the working area
- Thirdly, to prevent deformation from local overheating, the parts preheat to optimal temperatures.
- Then, in diffusion bonding in pressheating is easy to carry out in special ovens or with a burner.
Automatic diffusion bonding in press - equipment features
The process of permanent connection of parts is easy to carry out using equipment in a protective gas environment or flux-cored wire. Inverter devices with a non-consumable electrode, impulse devices with feeding into the working area of a consumable wire are common. In the second case, labor productivity increases.
When choosing equipment, it is necessary to take into account the characteristics of the material; otherwise the resulting seam will not meet the requirements.
- The diameter of the wire should be slightly smaller than the hole in the torch tip, as press expands strongly when heated.
- The length of the torch hose package should not exceed 3 meters, as thediffusion bonding in press is very soft and can deform during movement.
- The feed rollers must be smooth, no notches, and a 4-roller feed is common. Thus, deformation is minimized.
- Wire for bonding press must have specific properties that are achieved by alloying.
What is cooking press?
Cooking press with a semiautomatic MIG technology is more efficient and productive. The equipment is common for large volumes of work. If you sometimes weld individual parts with high demands on the quality of the seam, then an inverter machine using TIG technology is quite suitable.
Semiautomatic diffusion bonding in press technology is rather complicated. To obtain a high-quality seam, you must:
- correctly configure the parameters of the power plant
- choose a consumable
- Moreover, thoroughly clean the mating surfaces
- hold the torch at an optimal angle to surfaces
Correctly selected equipment and consumables will greatly facilitate the application of this technological process.
Application of diffusion bonding
Tungsten is the most refractory element, and the addition of special alloying elements expands the possibilities of using specialized equipment.
With the help of a rod, you can create high-strength and aesthetic seams that connect non-ferrous metals, and it is also common for diffusion bonding in press low and high carbon alloy steels.
How the choice of equipment is important?
The choice of the diameter of the rods is based on the features of the equipment and the thickness of the work pieces; products with a diameter of 1 to 6.4 mm are common. Medium sizes from 1.6 to 4 mm are considered popular.
How do we classify diffusion bonding in press?
For ease of selection, the electrodes come with specific colors in diffusion bonding in press that correspond to the chemical composition and have design for various operating conditions. Diffusion bonding comes by color as follows.
Importance of green color
Elements with such a coating do not have impurities and come of pure tungsten; therefore they are common when operating on alternating current. Sharpening a rod is much more difficult than an element with additives, so the point comes in the form of a ball.
Specification of gray color
These rods come with cerium oxide and have decent design to weld thin work pieces in diffusion bonding in press.
Advantages:
- the content of up to 2% cerium makes the electrode universal, it creates a stable arc under any conditions
- work at low currents is possible
- not susceptible to changes in polarity and type of current
Advantages of Turquoise in diffusion bonding in press
The rod contains lanthanum oxide, which spreads over the entire surface. The element is not radioactive and does not contain hazardous thorium; therefore its use does not harm the operator.
Advantages:
- good ignition and arc stability;
- Similarly, insignificant wear during work;
- Moreover, the ability to use on alternating and direct currents;
Such tungsten for argon is durable and allows you to keep the diffusion bonding in press factory sharpening for a long time.
Advantages of red
Thorium oxide is added to the rod, which provides low wear when using high currents. They have a design to work with low and high alloy steels, titanium, copper and their alloys.
Advantages:
- Generally, high strength of the seam and productivity of the process when using direct current;
- The ability to change the sharpening angle depending on the features of the problem solve.
Advantages of Purple
A strictly dosed mixture of rare earth metal oxides is common for alloying elements. Unlike thorium, these alloying additives are absolutely harmless to the environment. They have proven themselves well in the entire power range of diffusion bonding in press, which achieves by lower heating while maintaining a stable current density.
Advantages:
- the ability to work on currents of any type (DC or AC);
- good ignitability allows using the electrode on bonding equipment with automatic mode.
Such a rod is common to create permanent joints of high or low alloy steels, non-ferrous metals, titanium, magnesium, nickel, etc.
Summary diffusion bonding in press
The grades of diffusion bonding contain letter designations that determine the type of additive, as well as digital ones. Similarly, this indicates the percentage of the alloying element, the diameter and length of the rod.
