- pneumatic ball valve Using ordinary electrode excessive mixture surfacing welding repair method of pneumatic valve plate seal face

surfacing welding preparation good preparation before welding, which can avoid weld defects, but also to ensure the welding work smoothly. （ ） Surface cleaning before welding. To determine the precise location of the overlaying welding and sickles weldment surface rust, using oxyacetylene flame burn oil and impurities, reoccupy cotton to wipe clean. Then use Angle grinder grinding crack surface and its scope of mm on each side, until the metallic luster. （ ） Removal of corrosion pit. With Angle grinder in the surfacing welding workpiece surface along the corrosion pit on polishing the u-shaped groove, the bottom radius for ~ mm, flowing around ~ mm wide. Select electrode used for surfacing welding electrode, general special surfacing electrode brand for the DMo ( EDCrNi - B - ） Or Cr stainless steel electrode, to select the ideal Cr stainless steel electrode welding, the welding repair dosage is less, but the waste is big, electrode costs only need thousands of yuan each year. In order to save costs, shorten downtime and maintenance time. We choose the most commonly used E and E surfacing electrode mix, to reduce the stress concentration phenomenon of deposited metal, to prevent the welding zone cracks. This kind of electrode welding performance is good, can make all position welding, weld metal has good plasticity, toughness and crack resistance, belongs to the acid is too type calcium and sodium alkaline low hydrogen type electrode, including alkaline low hydrogen type electrode after welding, the weld metal per square millimeter of tensile strength is not lower than Mpa, also is the most economical, the most commonly used electrode, welding process simple easy to operate. Welding operations ( ） Welding machine. Choose model ZX - Inverter welding machine, due to the chemical composition of the filler metal, microstructure and physical properties and pneumatic valve plate seal face matrix material are not identical, to make the welding stress to buffer, need surfacing transition layer. Surfacing transition layer, E 30 should be adopted. Mm small diameter of electrode, small current, current should be controlled in ~ A to reduce the dilution rate, thus reduce welding stress, improve weld metal plastic. （ ） Welding process. Then fill the surfacing layer should be chosen when E, electrode diameter of 30. Mm, alkaline low hydrogen type electrode. Alkaline low hydrogen type electrode should be done before using ℃ ~ ℃ baking ~ hours, heat preservation. Should be repaired before surfacing welding pieces of the surface of the welding, and the sealing surface of surfacing welding layer close to mm within the scope of the nitriding layer and oil, rust, and impurity removal. At the same time using oxyacetylene flame preheating before welding butt welding parts are made to ℃ ~ ℃, using dc reverse connection, short arc, welding current to ~ A, via ℃ ~ ℃ tempering heat treatment after welding, so as to improve the hardening organization of welding area, in order to facilitate machining after welding. Conclusion overlaying welding technology in petrochemical industry plays a huge role, use overlaying welding technology can not only good for the unit to save a lot of cost, and shorten the maintenance time, extend the service life of the parts, in order to ensure safe and smooth operation of oil and gas production equipment in the production process, the welding repair of pneumatic valve can be normal use can also be downgraded, available in the by-pass system, water system and drainage system. Over the years, after repair of the pneumatic valve in the oil, gas, water production system plays a huge role, the service life of the average in more than three years, and special welding repair of pneumatic valve is basically the same. This work not only save considerable production cost, shorten the work time, at the same time created the huge economic benefits.
YAZE( Pneumatic company's main products: pneumatic pneumatic valve pneumatic ball valve pneumatic butterfly valve Keywords: pneumatic pneumatic valve pneumatic pneumatic valve