Casting is the basis of mechanical manufacturing process technology, for various reasons in the production process there will be a variety of defects, the rejection rate is higher. In addition, a variety of machinery and equipment in the cast iron pieces are easily damaged during use. Because of poor welding of cast iron, often after welding holes, deformation, easily broken, difficult to process, easy to produce white and welding of cracks, repair them to bring some casting difficulties. Bug fixes for cast iron, welding repair process to resolve the white, hot cracking, deformation and processing performance issues, so far, domestic and international which is still not completely solved the problem of the theory and methods. Cast iron welding is the enterprise a big problem. 
 Triple the company's technical staff in order to solve this problem, efforts of more than two years of disdain for the performance of cast iron itself, after thousands of experiments has finally developed a cold fill machine series of SH-07 Precision welding of cast iron supplement . SH-07 Precision welding of cast iron make up the principle of pulse jet and advanced digital control technology to improve the waveform and arc welding process performance, a comprehensive solution to cast the problem of poor welding performance products, such as stomata often after welding, deformation, easy to break, easy to produce white and welding cracks. 
 SH-07 Precision welding of cast iron supplement for ductile iron castings, gray iron castings, malleable iron and white cast iron and other iron products, welding, welding. With the welding of high efficiency, good quality, low cost, easy to operate, solderability and high heat affected zone is small, no deformation of the workpiece, the weld shape aesthetic advantages. 
 SH-07 precision welding of cast iron supplement on the theory and process to resolve the following issues: 
 (1) to solve the white problem: 
 SH-07 uses a special type of cast iron welding arc welding power make use of digital control technology, the welding current control for precise welding time, to improve the waveform and arc welding process performance. According to our experimental data confirm thousands, SH-07 type can not only reduce the amount of welding heat input region, its temperature is always relatively low, while the critical current by less than the average spray transition current to achieve spray transfer, pool much smaller. Base metal and welding rod from the hardened layer fusion zone microstructure analysis, the white layer thickness less than 0.06mm. International practice, the white layer thickness if less than 1mm, the casting process has no effect on cutting tools can be basically negligible. 
 (2) to solve the iron "cold welding" process weld crack problem: 
 Welding cast iron is a partial fast heating, so the temperature differential is inevitable, when the thermal stress is greater than the tensile strength of cast iron weldment heat generated when the inevitable crack. SH-07 the instantaneous current density, welding pulse current time is very short (generally less than 0.05s), using cold welding of cast iron used market (such as the Z308 Z408 etc.). Can significantly reduce the heat affected zone, while improving weld and to decrease stress, which most effectively prevent the emergence of crack, while fusion zone hardness decreased significantly. Do not destroy the original precision machining, welding areas are basically the same color and the base metal, applicable to all