08 Dec 2018
Characteristics ■ Good hygienic performance: PE pipe processing does not add heavy metal salt stabilizer, the material is non-toxic, no fouling layer, no bacteria, and it solves the secondary pollution of urban drinking water. ■ Excellent corrosion resistance: It can resist the erosion of many chemical media except a few strong oxidants; there is no electrochemical corrosion. ■ Long service life: PE pipes can be safely used for more than 50 years under rated temperature and pressure conditions. ■ Better impact resistance: PE pipe has good toughness and high impact strength. Heavy objects directly press through the pipe and will not cause pipe rupture. ■ Reliable connection performance: The strength of the PE tube hot melt or electrofusion interface is higher than that of the pipe body, and the joint will not be broken due to soil movement or live load. ■ Good construction performance: the pipeline is light in weight, the welding process is simple, the construction is convenient, and th...
30 Nov 2018
Introduction Polyethylene pipe (PE pipe) English name: Polyethylene PE pipes are used in a wide range of fields. Among them, water supply pipes and gas pipes are the two largest application markets. PE resin is polymerized from monomeric ethylene. Due to different polymerization conditions such as pressure and temperature during polymerization, resins of different densities can be obtained, and thus high density polyethylene, medium density polyethylene and low density poly are obtained. The fraction of ethylene. When processing different types of PE pipes, depending on the application conditions, the resin grades are selected differently, and the requirements for extruders and molds are also different. Internationally, the material of polyethylene pipe is divided into five grades of PE32, PE40, PE63, PE80 and PE100, and the materials used for gas pipes and water supply pipes are mainly PE80 and PE100. China does not classify special materials for polyethylene pipes, which makes it dif...
Operation points of steel butt welding machine
24 Nov 2018
Operation points of steel butt welding machine The welder operator must be professionally trained, familiar with the welder construction, performance, operating procedures, and master the knowledge of process parameters selection, quality inspection specifications. Before operation, check whether the welding machine mechanism is sensitive and reliable, whether the electrical system is safe, whether the cooling water pump system has water leakage, and whether the lubrication parts are well filled. It is strictly forbidden to weld steel bars exceeding the specified diameter. The main ribs must be welded and then cold drawn. In order to ensure the quality of the welding, it is necessary to carry out cleaning, rust removal and correction in the range of about 150 mm. When working with the operator, you must bring colored protective glasses and hats to prevent the eyes from irritating the eyes and molten metal from burning the skin. The butt welder should be parked in a clean, dry and venti...
16 Nov 2018
USE 1. Butt welding process According to the working principle of the butt welding machine, the butt welding process can be divided into two types: resistance butt welding and flash butt welding: Resistance butt welding Resistance butt welding is to cut the power supply after heating the end joint of the steel bar to plastic state, and then heating to reach the plastic connection. This welding process is prone to oxidation and slag inclusion at the joint, and requires that the cross section of the steel bar be smooth and flat, and the power consumption during welding is large, requiring high power of the welder, so it is rarely used. Flash butt welding Flash butt welding refers to the spraying of molten metal particles from the end joints of the steel bars during the welding process, which is a spark (ie, flash). At the same time as the molten metal is ejected, the oxide and the slag are also taken out, so that the quality of the butt welded joint is good, and thus it is widely used, e...
10 Nov 2018
Technology 1) Program-controlled voltage reduction flash soldering This soldering method is characterized by a high secondary no-load voltage at the beginning of the flash to facilitate the excitation of the flash. When the temperature of the end face rises, the low-voltage flash is used and maintained. The flash speed is constant to increase thermal efficiency. When approaching the upset, the secondary voltage is increased to make the flash strong to increase the self-protection. Compared with preheated flash butt welding, the program-controlled voltage reduction butt welding has the advantages of short welding time, low power consumption and uniform heating. 2) Pulse flash butt welding This welding method is characterized in that, in the stroke of the moving clamp, a reciprocating vibration stroke is superimposed by the hydraulic vibration device, the amplitude is 0.25-1.2 mm, and the frequency is 3-35 Hz uniform. Tune. Due to the vibration, the end faces of the weldments are alterna...
02 Nov 2018
Safe operation (1) The work surface of the shuttle should be kept horizontal with the lower part of the cutter. The length of the worktable can be determined according to the length of the processed material. When processing long steel bars, there should be special personnel to help, and follow the instructions of the operators, and do not push and pull at will. (2) Before starting, it is necessary to check that the cutter should be free of cracks, the bolts of the knife holder are fastened, and the protective cover is firm. Then turn the pulley by hand to check the gear meshing clearance and adjust the cutter clearance. (3) After starting, it should be operated first, check that all transmission parts and bearings are running normally before operation. (4) Do not cut the material when the machine does not reach the normal speed. When cutting, the middle and lower parts of the cutter must be used. The steel bar is quickly fed into the knife edge. The operator should press the steel bar...