2results about How to "Smooth welding surface" patented technology

This invention discloses an internally threaded steel pipe, its processing technology, and processing device. The internally threaded steel pipe includes a stainless steel inner tube (1), which is formed by rolling stainless steel strip. The inner wall of the stainless steel inner tube (1) is provided with thread teeth (2). The number of thread teeth (2) is multiple and they are distributed in a ring along the inner wall of the stainless steel inner tube (1). A thread groove is formed between adjacent thread teeth (2). This invention can reduce the production cost of internally threaded pipes for air conditioners and improve their service life.

The utility model discloses a wear-resistant ceramic welding backing, which relates to the technical field of welding and comprises a ceramic backing body, the ceramic backing body comprises a backing main body, a welding groove is formed at the top end of the backing main body, and tin foil paper and adhesive paper are arranged at the bottom end of the backing main body. The outer wall of the gasket body is sequentially covered with a metal reinforcing layer and a whisker wear-resisting layer, and a rib wire assembly is laid in the gasket body. According to the wear-resistant ceramic welding backing ceramic, the outer wall of the backing body is sequentially covered with the metal reinforcing layer and the whisker wear-resistant layer, the metal reinforcing layer optimizes and improves the mixing proportion of silicon carbide and graphite, the hardness and the wear resistance of the ceramic are correspondingly improved, the whisker wear-resistant layer is made of calcium carbide whiskers, and the material is high in friction coefficient and good in wear resistance. The wear resistance and the heat resistance are high, and the wear resistance of the ceramic liner body is further improved; and by arranging the rib wire assembly, the whole ceramic gasket body can be completely taken down so as to be convenient to use.