What are the basic features of the negative pressure resistant rubber soft connection?
Negative pressure resistant rubber soft connection selection of molded or spinning method, and the barrel grouping to butt mainly, all interface parts are selected mechanical flanging method to ensure smooth transition. All weld seams shall not be lower than the negative pressure resistant rubber soft connection, the ideal condition is flush with the negative pressure resistant rubber soft connection, if higher than the negative pressure resistant rubber soft connection, then higher than the negative pressure resistant rubber soft connection parts should also be oil smooth, there shall be no pits, pockmarks. Butt, welding, to ensure that the inner wall of the pipe to gapless butt, welding negative pressure resistant rubber soft connection within the full suspension of argon protection, argon gas purity to reach more than 99%; all welds shall not have porosity, slag, high and low unevenness, negative pressure resistant rubber soft connection after welding to repair the weld to oil smooth, bright.
All pipes, interfaces in the production are to be machined bevels. Workplace severe implementation of negative pressure resistant rubber soft connection and other materials separately, to ensure that the material is not contaminated with iron and copper. Negative pressure resistant rubber soft connection first of all to suspend welding appearance inspection, negative pressure resistant rubber soft connection surface to clear clean, there shall be no cracks, porosity, arc pits and spatter, the joint does not bite the edge; the main points of the weld and parts to suspend the main points of control, the negative pressure resistant rubber soft connection of all welds and the lower cylinder and negative pressure resistant rubber soft connection between the ring weld to suspend 100% penetration testing, in line with JB/T4730.5 "Pressure-bearing Equipment nondestructive testing" in the Ⅰ level qualified.
For the heat treatment technology of the appearance of the negative pressure rubber flexible connection, foreign countries throughout the use of five oxidation with maintenance gas continuous heat treatment furnace, heat treatment and product heat treatment in the question. Because the bright appearance without oxidation can be obtained, and then cancel the traditional pickling process. The choice of this heat treatment process, both to improve the quality of negative pressure-resistant rubber flexible connections, but also to overcome the pollution of the environment by pickling. In metal materials with high level of dislocation energy is prone to dynamic response.
It leads to the phase elimination of dissimilar dislocations, constituting sub-grain and regular sub-grain boundary, dynamic recovery eliminates the strain generated by the process of hardening, to reach a stable stress state. On the contrary, for metal materials with low dislocation energy, when the dislocation buildup to a certain degree, the partial dislocation density difference is sufficient to make the thermal deformation of the material onset of dynamic resulfuration nucleation, and dynamic resulfuration grains will be relocated through the large angle grain boundary so that the dislocation density is sharply reduced, reducing the deformation stress.
It is generally thought that dynamic resulfuration is the same as static resulfuration, which is also carried out by forming new large-angle grain boundaries and their subsequent movement. Following the addition of the deformation disk, the area in the material guess not re-vulcanized constantly constitutes new dynamic re- negative pressure resistant rubber flexible joint, and only a limited growth, together with the onset of dynamic re-vulcanization of the region will continue to deformation and accumulate to meet the re-vulcanization drive and repeat the onset of dynamic re-vulcanization.
