Whenever mention when stainless steel juicer filter basket, everyone will invariably think of bright surface, acid and alkali resistance very strong product, with the rapid development of China's economy, consumption and production of stainless steel has been greatly growth in China's economic construction which, stainless steel plays a very important role, its corrosion resistance is very strong, get a wide range of applications in the construction, shipbuilding, aerospace, automotive and many other industries. However, as the stainless steel welding process in which a technology indispensable, the process will have a direct impact on the quality of stainless steel, so the proposed requirements for the welding process will be more stringent. At present, China's stainless steel welding technology level is still some distance relative to foreign terms, but in order to shorten the gap, we need to strengthen the research in terms of stainless steel welding process, thus improving the quality of stainless steel in the international market to strengthen the country's competitiveness . We in the processing of stainless steel filter commonly used are the following major categories.

A first austenitic stainless steel. As the most important stainless steels, austenitic stainless steel at the bottom temperature, high temperature environment has a very good corrosion resistance, cold workability and plasticity and toughness, the official Because of this superiority, as a very good welded structure is widely used in construction, aerospace and chemical industries were. However, austenitic stainless steel knife-like joints occur and cause stress corrosion cracking joints, for single-phase high nickel content of austenitic stainless steel, lead joints can also occur due to hot cracking.

The second precipitation hardening stainless steel. Precipitation hardening stainless steel not only has good strength and corrosion resistance, but also has good plasticity and toughness of austenitic stainless steels, and austenitic stainless steel has a similar welding performance. Under normal circumstances, the welded joints will not occur due to excessive heat or cold cracking phenomenon. However, the precipitation hardening stainless steel has a strong sensitivity to the gap would therefore lead to the possibility of a big break.

The third ferritic stainless steel. Ferritic stainless steel with strong thermal stability, but also has some corrosion resistance. However, ferritic stainless steel compared to the thermal expansion coefficient and almost, and austenitic stainless steel is small compared to the other, silicon and chromium and other elements can be formed ferrite, while sulfur and phosphorus, easily dissolved in the ferrite in the crystallization of the weld, it is the formation of low melting point eutectic lead to a bad phenomenon, and austenitic stainless steel, compared Due to the possibility of generating cracks on the hot lead to small, at the same time, when the welding heat affect zone supercritical temperature region, the amount of martensite formed ferritic stainless steel will be much less, therefore, the ferrite delayed cracking susceptibility of stainless steel will be much smaller than martensitic stainless steel. In short, in the welding, crystalline particles easily grow to form coarse ferrite cause embrittlement is a major problem ferritic stainless steel.

In recent years, the fourth new duplex stainless steel. In duplex stainless steel, ferritic and austenitic microstructure accounts for half of each, also called mean austenitic - ferritic stainless steel, can be seen, the welding performance with their ferritic steels and austenitic steels excellent performance. However, the proportion of austenite and ferrite determines the duplex stainless steel welding performance, so long as the proper material selection and process, it will produce a good weldability amount of duplex stainless steel. Because of duplex stainless steel with a low-temperature toughness, good performance and high resistance to stress corrosion cracking resistance, high fatigue strength, etc., are applied to a wide range of chemicals, natural gas and other industries.

Fifth martensitic stainless steel. Compare and ferritic stainless steel, martensitic stainless steel is much less iron content in chromium ferritic, and the formation of carbon austenite lot more. Martensitic stainless steel is hardened tissue, when exposed to high temperatures and also relatively fast cooling environment, the steel will be transformed austenite occurs, making austenite into martensite. When the welding time, under the powerful influence of heat cycle in the heat-affected zone and weld the organization after soldering becomes hard and brittle and easy to crack due to cold forming martensite, while accompanied by the carbon content the increase in the formation of cold cracking phenomenon will be more serious. In addition, the emergence of one of the crystalline particle coarsening phenomenon is also the problem of martensitic stainless steel. Near the weld area due to the cooling rate is too coarse to produce martensite, also due to the cooling rate is too small to produce coarse carbides organizations and ferrite, which have led to greatly reduced toughness and plasticity. In short, crisp and cold cracking joints martensitic stainless steel is a major problem exists.

We classified these five is drawn when the filter used by the stainless steel, we will be able to adapt to the environment according to the strength requirements and have an overall understanding of the above selection, five types of types by selecting the most appropriate products.