Production process of titanium pipe fitting

1.2.1 multi-weld titanium elbow

China's titanium pipe in the initial use of domestic manufacturers does not have standard titanium pipe fittings, had to make people use multi-wild type (commonly known as "shrimp waist") titanium elbow. Its processing technology is complicated. Usually employed to cut the tube into a number of diagonal, welded or sheet metal into a multi-leaf-shaped development of materials, and then roll welding, weld volume. Since the geometries of the welds are discontinuous, a higher stress concentration will occur, so that the working pressure and operating temperature for such fittings must be specified. 2 welds will greatly reduce the corrosion resistance, easy to leak, and the appearance of weak, the inner surface of the fold and increase the pipeline transmission resistance and the back of the weld by a serious erosion corrosion and reduce the life.

1.2.2 welding tee to take in the straight pipe on the hole, the branch directly from the welding, because the processing performance of titanium as additional materials, welding at intersecting line processing is also very difficult. More importantly, the weld at the right angle, one is a serious impact on the media flow, increasing the transmission resistance of the pipeline, the second is the intersection of the curve of the welding difficulties, three corners of the coring erosion increased So that the right angle part of the early loss.

1.2.3 Flattened Welded Titanium Elbows In order to improve the defects of multi-weld titanium elbows, press the semi-welded titanium elbow. It is more with the "shrimp waist" type compared to the wild less corresponding, and the weld is not exposed to erosion by the erosion, and the direction of the erosion, and thus better than the decay resistance.

1.2.4 Casting elbow people attempt to get rid of the weld, developed a seamless titanium elbow, resulting in casting elbow, although the emergence of a seamless elbow, but the wall thickness (at least 5mm) and pipe wall thickness 2 ~ 4mm) can not match, and the surface finish is poor, and increase the transmission resistance. More important is the existence of a large number of defects caused by the casting and other defects, seriously affect the corrosion resistance and life, not suitable for the use of titanium alloy pipe, mostly used in small diameter bearing pipe, this process Production of titanium pipe pieces of high cost, not the user's identification.

1.2.5 punching titanium elbow Some people use the stamping method to punch the titanium elbow, the appearance seems to meet the standard requirements, but in essence, the processing technology is the tube in the punch punch stamping die forming, forming The process will pull the back of the elbow, forcing the back thin, abdominal wall pressure and thickening caused by uneven wall thickness or wrinkle. And the use of the process due to elbow erosion, due to the back wall thinning, so the book will have early damage. Wall thickness is sometimes difficult to guarantee, its pressure and life are not up to the standard wall thickness tolerance requirements, try not to use this process to produce titanium elbow.

1.2.6 Improve the lives of titanium pipe fitting and pipe design technology into a major academic problems. The elbow pushing process got a new technology for the production of a steel elbow in China in the late eighties and later introduced by Japan. As the process can achieve continuous production, and the production of elbow wall thickness uniform, so it quickly replaced the traditional process.