Hebei Province, Wu County five the welding equipment factory. Production and marketing: point welding machine, pneumatic spot welding, nuts, spot welding machine, welding machine, welding machine, copper rod welder, aluminum welding machine, band saw blade welding machine, rolling machine, rebar straightening machines, wire welding machines, wire welding machine, copper wire welding, aluminum welding machine, the cages spot welder, spot welder steel and according to customer requirements custom-made all kinds of special special equipment. Welcome to inquire: Contact: Yu Zhendong. Tel :0318 -3727375. Mobile: 15512963508. Website: www.buydhj.com DNK-25/40/75/100/150 pneumatic point welder uses the first part of the manual: the principle of spot welding and welding technology spot welding process is a permanent combination of metal connection. Weldment welding current through the welding localized heating and applying pressure, and in contact with the heating of the weldment at the formation of a solder joint. Spot welding is a high speed the economic connection method, it can be used for the manufacture of lap joints airtight No, a thickness of less than 5mm stamping rolled sheet member. Spot welding is widely used in various industrial sectors, not only to welding low carbon steel and low alloy steel, high carbon steel, high manganese steel and stainless steel, aluminum, titanium and other materials can be welded parts. Spot welding process parameter selection: Impact spot welding process parameters including the structure of the welding electrode diameter, welding power, welding time and welding pressure. Depending on the welding speed and welding results can be divided into the the rapid welding, welding speed, welding three conditions require welding, high strength, a small welding deformation occasions, and the best selection of high-power, strong specification for a short period of rapid welding the workpiece. Is not strictly required workpiece using ordinary welding of low-power, long-term, such relatively small welding equipment can be selected, at the same time is also relatively small impact on the grid. Typically is a reference to the colors of the materials according to the material and the thickness of the workpiece, the welding condition table selection, first determine the shape and size of the end surface of the electrode, the electrode pressure and welding time followed initially selected, and then adjust the welding current, the type of welding current sample test nugget diameter to meet the requirements, and then in the proper range to adjust the electrode pressure, welding time and current sample welding and inspection, until the solder joint quality in full compliance with the technical conditions prescribed requirement. The method most commonly used test specimen is torn method, quality solder joints signs are: a tear sample hole, circular boss on the other sheet. Slab or quenching material sometimes can not be torn out of the circular hole and the boss, but by shearing fracture Analyzing nugget diameter. If necessary, need low times of measurement, tensile test and the X-ray inspection to determine the rate of penetration, shear strength, and the presence or absence of shrinkage, cracks, etc.. Should give full consideration to the sample selection process parameters, specimens and artifacts in the shunt, ferromagnetic materials, as well as assembly gap differences, and be properly adjusted. The main factors affecting the spot welded joints welding quality welding current, electrode force, welding time, the preload and resting time, the diameter of the welding electrode. 1, the nugget formed by spot welding of the welding current required to heat source is heat generated using the current through the resistance of the weld zone. In the case of other conditions given, the size of the welding current determines the rate of penetration of the nugget. In the welding of low carbon steel, the the nugget average penetration rate of 30 to 70% of the plate thickness, the nugget penetration rate at 45 ~ 50% of the highest welding strength continues to increase, when the welding current exceeds a specified value, The large current can only increase the rate of the nugget, and without increasing the strength of the joint, due to consume more energy and increases the loss of the equipment, in terms of the manufacturing cost is very economical. If the current is too large will produce too deep indentation and welding burn-through defects. 2, the electrode pressure the spot welding electrode pressure against the impact of the nugget size is relatively large. Electrode pressure is too high indentation too deep, and it will accelerate the deformation and loss of welding electrodes. Pressure prone to shrinkage, and increased contact resistance welding electrodes wear and shorten its life. 3, welding time spot welding, mainly by welding time control nugget size, in the case of other welding parameters constant, welding the longer the greater the nugget size. Occasions in weld strength requirements, the general should choose the welding energy and relatively short welding time. Special attention is the welder welding longer will increase energy consumption, but also increase the electrode wear and reduce the life of the equipment. , Preload and maintain pre-press time is the time from the foot switch to the signal, the cylinder began to power compression welding, grasp the principle cylinder compression artifacts, air pressure rises to the set The value is just around the welding time is appropriate. Factors affect the preloading time the cylinder the the operation stroke length and speed of movement of the cylinder, if the preloading time is too short, there may be no pinch has been powered welding, resulting in the burning of the welding electrode and the workpiece, the welding quality can not be guaranteed. Pressed too long will reduce production efficiency, might even work pressure cause deformation. Maintain time refers to the period of time after welding to the cylinder lift reset. Due the nugget formed just need to continue pressurized remain for some time, there may need a greater pressure than the pressure at the time of the welding is applied in the just finished welding workpiece, increased pressure during the forging time, does not change the pressure time is to maintain time, this time from the welding process is generally not very demanding, as long as they can meet the weld strength on it. Maintenance of spot welding or forging time is generally controlled at 0.1 to 1 seconds or so. 5, the structure of the welding electrode welding electrode structure can also impact on the workpiece is relatively large, especially the diameter dimension of the welding electrode and the end surface of the diameter and length of the welding current, the more the diameter of the electrode body in the case of other parameters do not change, , the smaller the diameter of the electrode end face, the welding current density greater welding pressure on the unit area is greater. The type of electrode material and structure must therefore be selected according to the type of workpiece thickness structure.