Heat welding method prevents the workpiece to produce a white tissue and cracks, and weld up the good quality, can be machined after welding. However, the higher the cost of heat welding method, low productivity, poor working conditions of welders.

hot solder to prevent white from the workpiece port organizations and cracks, fill in better quality welding, soldering can be machined. But the soldering method with high costs, low productivity, and welder's poor labor conditions.

The thermit welding law may prevent the work piece has the grade of bessemer steel organization and the crack, welds makes up the quality to be good, after welds may carry on the machine-finishing.But the thermit welding law cost is high, the productivity is low, the welder work condition is bad.

Heat welding can prevent white cast workpiece structure and crack, better quality welding, welding can be machined. Heat welding high cost, low productivity, welders working conditions poor.

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