Amorphous Active Low Temperature Welding Technology

The advantages of non-crystalline active low temperature welding are:
Pure titanium, titanium alloy and steel, stainless steel, copper and other dissimilar metals welding;
The welding temperature is much lower than the melting temperature of the metal, making welding easier and more economical;
Form a firm adhesive layer to ensure high firmness of solder connection;
The high mechanical strength of the welded structure can be maintained for a long period of time (theoretically 1012 years) at low temperature and constant temperature;
Amorphous structure has high chemical stability and tends to be inert under external force, and high corrosion resistance;
Amorphous properties for titanium welding
Amorphous combination
Ti foundation-Ni-Zr-Cu
Ti foundation-Ni-Zr-Cu-Be-V
Zr foundation-Ni-Ti-Cu-Nb-P3M
Welding temperature ℃
900-1000
850-950
800-900
The principle of application of amorphous welding:
The amorphous component of the amorphous melt has high diffusivity of atomic movement when the amorphous melt is melted, which shortens the heat treatment time in the welding process.
Using amorphous welding whose temperature is lower than the metamorphic temperature of pure titanium α-β, the use of such an amorphous material ensures high mechanical strength after welding and no reduction in metal properties after welding.
Taking into account that the amorphous (glass morphology) state possesses a high degree of chemical and structural uniformity, plus the effect that all amorphous can be called “instantaneous” melting, the thermal effects of the welding process can be The structural changes of the alloy are reduced to a minimum.
The high physicochemical activity of non-crystalline components can allow welding fast enough, so-called reactive precision welding (активная прецизионная пайка). This, in turn, significantly reduces the destructive effect of thermal energy during welding on the mechanical, corrosive, and other characteristics of the welding material.
Amorphous welding is an ideal welding technology applied to heat exchangers composed of a large number of thin-walled components (tubes), special parts of dissimilar metals, and highly corrosion-resistant complex titanium containers.
The welding joint of this technology has the following characteristics:
Very high vacuum tightness, because the diffusion layer is formed;
It has high strength under constant or variable load, vibration load and impact load.
Very high corrosion resistance
Titanium material connection strength can reach 400 MPa.
Amorphous materials will be widely used in the welding field because it has two fundamental advantages:
1. A structure is obtained due to rapid cooling at high temperature. It is impossible for this structure to appear in a crystalline state (pseudo alloy).
2. Amorphous ribbon or powdered solder (made by grinding the ribbon) can be obtained directly from liquid state just like preparing semi-finished products.
The application of amorphous ribbon and powder has the following advantages compared with the traditional method:
Band shape is easy to polish and cut;
The belt can be punched and cut;
The belt will not lose the amorphous when it is crushed into powder by entering the crusher;
Powder can be easily filled into the welding seam;
The chemical composition of 　　 tape is uniform and the thickness difference along the length is not more than ±8%.
The soldering of amorphous solder needs to be done in an electric or gas burning furnace in a neutral gas environment. Normally, when applying amorphous solder, a transition layer is generated at the solder joint, and crystal generation and diffusion connection occur. This ensures the uniformity of the welding and no corrosion.
Amorphous solder is in a high-energy saturation state and can actively flow into pores and joints, which can meet the atmospheric density requirements at the junction in most cases.
Amorphous solder can also be used in the welding of various cermet types of materials, different types and the same kind of metals and alloys can be used (stainless steel, titanium and copper alloys, refractory metals, aluminum nickel and other alloys)
Basic industry sectors of application: aerospace and aerospace industry, semiconductor field, instrument manufacturing, electronic and electrical engineering, chemical machinery manufacturing, etc.
The advantages of applying amorphous welding to the tubes and tube sheets of welded heat exchangers over argon arc welding are that in addition to the above, all heat exchanger tubes can be in a heating furnace after 15-20 minutes at the same time Complete welding.
The current requirements for welded structures are more stringent. The welded structure not only needs to ensure that the structural strength meets the requirements, but also for some specific parts, it also needs to ensure good thermal engineering requirements (the temperature loss coefficient value of the weld area cannot be higher than the value of other points selected on the structure at a long distance) .
Replace the existing complicated and expensive welding methods with more economical and better amorphous solder welding technology, which is ideal for welding thin-walled honeycomb structures.