Sh-07A precision welding of cast iron supplement the main features and applications: casting is the basis of mechanical manufacturing technology, for various reasons in the production process there will be a variety of defects, a high rejection rate. In addition, a variety of machinery and equipment in the iron castings are easily damaged during use. Due to poor welding cast iron, weld porosity often, easily deformed, easy to break, hard working, easy to produce white and weld cracks, which brings certain difficulty to repair castings. For iron casting defect repair, welding repair process to resolve the white, hot cracking, deformation and processing performance and other issues, so far, the theory and methods of international and domestic this still does not solve these problems. Cast iron welding enterprise The one big problem. Triple the company's technical staff in order to solve the above problems, after two years of disdain efforts to cast itself for performance, after thousands of experiments finally developed a cold patch welder series SH-07A Precision welding cast iron supplement . SH-07A Precision cast iron supplement welder uses the principle of pulse jet and advanced digital control technology to improve process performance and arc welding waveform, a comprehensive solution to poor soldering iron product performance problems, such as post-weld often porosity, deformation, easy to break, easy to produce white and welding cracks. SH-07A Precision fill welder for welding cast iron ductile iron castings, gray iron castings, malleable iron and white cast iron and other cast iron products, welding. With high efficiency, good quality, low cost, easy operation, high welding, small heat affected zone, no deformation of the workpiece, weld appearance and so on. SH-07A Precision Cast fill welding theory and technology to solve the following problems: (1) to solve the problem of white: SH-07A using a special type of iron supplement arc welding power source with digital control technology, the welding current precise welding time control, improve process performance and arc welding waveform. According to our experimental data confirm that thousands of times, SH-07A type only can reduce the heat input weld region, so that the temperature is kept relatively low, while the use of less than the average current spray transfer critical current to achieve spray transfer, the bath much smaller. Base metal and welding hardened layer from the fusion zone microstructure analysis, the white layer thickness of not more than 0.06mm. International practice, white layer thickness is less than 1mm, no effect on the casting process of cutting tools, which can be negligible. (2) to solve the cast iron "cold welding" process weld cracking problem: the welding of cast iron is localized rapid heating, the temperature non-uniformity is inevitable, when the thermal stress is greater than the tensile strength of the welded pieces of iron bound thermal cracking. SH-07A due to the instantaneous current density, welding pulse current time is very short (usually less than 0.05s), using conventional cast iron cold welding market (such as Z308 Z408, etc.). Can significantly reduce the heat-affected zone, and stress while improving weld down to most effectively prevent cracks, while the fusion zone hardness decreased significantly. Do not destroy the original precision machining, welding area are basically the same color and the base metal, for various complex welding of thin-walled parts. (3) to solve the problem of fusion: SH-07A precision iron supplement welder welding process due to the use of pulsed spray transfer which prompted graphite combustion, combustion CO may promote fusion of the pool boiling so greatly changed. Weld tissue matrix organization with fully integrated, linked closely together. SH-07A Precision welding is cast iron supplement metallurgical bonding defect repair equipment, the use of pulse jet (low heat input) does not produce undercut edge collapse phenomenon, stress is small, small heat-affected zone. Our pioneering SH-07 iron supplement solve the fundamental problem of welding cast iron welding, so welding process is not complicated, general welder welding work can comfortably implemented, resulting in improved productivity and save a lot of energy to enhance competitiveness of enterprises. Currently, the company is applying for national patent. When SH-07A precision welding of cast iron cast iron supplement machined surface and non-processed surface defect repair, no preheating before welding, no heat treatment after welding, after welding, grinding or directly on machinery for cutting, including energy in the weld zone drilling and tapping holes, and ensure their precision, but also relatively easy to make the weld zone and base metal color consistency. SH-07A precision iron supplement welder welding process is relatively common technique is simpler, easier to master welder, more economical material and energy costs.