How to weld cast iron tractor

Using a tractor repair welding of cast iron pieces, in addition to the actual situation the appropriate choice of welding methods, but also note the following items:

First, the pre-welding welding welding welding parts of the former should be in and around all harmful impurities such as rust, oil, paint, etc. thoroughly cleaned; welding cracks if the weldment thickness less than 25 mm in diameter should be drilled only about 4 mm hole; some weldment process but also according to the requirements of selected wall thickness and groove type and so on.

Second, the choice of electrode diameter and the different types of cast iron should be used in the corresponding electrode; primarily on the basis of its diameter at the welding weldments to determine the thickness; White and death in order to prevent the generation of the fire organization, reduce the heat-affected zone , the current use of small diameter electrodes.
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Third, the polarity of the DC arc chosen, in order to avoid the penetration is too large, overheating and burn weldment, are using reverse polarity connection, that weldments - then the cathode, the anode electrode connected.

Fourth, the current intensity of choice to increase the current penetration is too large, welded metal components and impurities to the weld pool changes the diffusion properties; current is too small to affect the stability of the arc, easy slag, porosity and other defects; current intensity selection should be based on cracks or defects in the welds steric conduction, taking also into account grades and electrode diameter.

V. welding operation points in order to reduce crack welding area should be avoided overheating, long cracks should be stopped, sub-stitch welding; to reduce penetration, should choose a small current, small electrodes, and as a short arc welding; for better welding of plastic such as nickel-based welding, metallurgy and welding, welding immediately after light tapping with a hammer round weld to weld stress relaxation, clear cracks and holes; not every small solder wave across the slope while on both sides, it is a good part of freedom of contract is not welding, and arc in the groove on both sides to avoid to stay too long; the bottom solder layer should cover the bottom of annealing, change to its processing performance.
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