Stainless steel composite process
In general, there are three kinds of stainless steel clad plate production methods: direct rolling stainless steel composite plate (also known as pressure welding or solid phase welding), explosive composite method and explosive welding rolling synthesis technology. Composite plate with different thickness and different ratio, different varieties, different specifications and different requirements, respectively, using the three kinds of processing technology, classification of production, varieties and specifications of the composite board is greatly increased, product appearance, reliable quality, can meet a variety of different users, different industries, different environment and different conditions of use requirements.
Rolling composite method is a method of producing metal stainless steel composite plate by using pressure process. There are two kinds of cold rolling composite and hot rolling composite. The basic principle is the need of two kinds of metal compound in certain proportion and requirements into the rolling mill, rolling mill in great pressure, or with thermal effect by combining the two kinds of metallic composite plate occurred in the whole cross section of plastic deformation, prompting to composite surface deformation, clean and activation. Along with the formation of planar metallurgical bonding. The basic requirement of rolling compound is the rolling equipment with great pressure and the professional technology of producing composite board. The stainless steel composite plate made by this method has the following advantages: (1) it can enlarge the dimension (length and width) of the composite panel. (2) the production cost is low, and the products are competitive in the market. (3) from raw materials to finished products can be continuously produced, suitable for mass production. (4) it is easy to set up a production line with higher automation. (5) the composite material is not easy to be contaminated by the base material, the combination property is good, and the product quality is stable.
Explosive composite method uses explosive as energy source, and combines two or more than two stainless steel composite plates with different properties, especially non melting, into a whole. Compared with the rolling method, (1) the loading speed is fast, that is, the instantaneous loading process. (2) applied to the workpiece of high voltage pulse load, load should yield strength is much higher than that of metal materials. (3) the bonding zone presents a wavelike metallurgical bonding feature. (4) it is difficult to realize automatic production, moreover, the labor intensity of workers is high, and the production cost is higher. The basic principle of this method is that the two metal plates need to be assembled according to a certain method. The special explosive is placed on the laminated material and the detonator is placed at a specific position. When the explosive is triggered, the high voltage pulse produced by the explosion acts on the compound plate, and the plate is accelerated to a few hundred meters per second in microseconds. From the beginning of detonating position, clad in turn with the basal plate form inclined collision, two plates collide to produce metal dynamic pressure exceeds the yield limit in the adjacent area collision point, high speed and strong plastic deformation, and with certain adiabatic effect. The surface of the two metal plates to be combined, in a moment similar to the fluid like behavior, the formation of metal jet two movement in the opposite direction, is located in the free jet collision point to the unbound space high speed from the area, washed away two metal plates to be combined on the surface of the oxide film, pollutants, reveal the activity of clean surface and provide the necessary conditions for the realization of welding; in the collision point after the jet angle, "solidification" between two metal plates forming a wavy metallurgical bonding characteristics.
