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Overlaying welding technology of ductile cast iron roller

A technology for ductile iron and repair welding, which is applied in the direction of manufacturing tools, welding equipment, welding accessories, etc., can solve the problems of difficult repair and poor weldability, avoid weld cracks and fusion zone cracks, prolong service life, and be economical benefit effect

Active Publication Date: 2011-01-19
CHANGZHOU HAIJIE METALLURGICAL MACHINERY MFG
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Problems solved by technology

In order to prolong the service life of the product and reduce economic losses, it is necessary to repair the cracked nodular cast iron roller. In view of the poor weldability of this steel type and the difficulty of repair, researchers in this field must adopt a special welding process to solve the problem. this question

Method used

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Embodiment Construction

[0014] A repair welding process for ductile iron rollers, which includes the following steps:

[0015] (1) Preparation before welding

[0016] a. Check the crack: Check the position of the crack before welding, find out the end of the crack extension, and drill a crack stop hole φ5mm at a distance of 3-5mm from the end of the crack;

[0017] b. Control of welding materials: choose Z408 nickel-based electrode, and dry the electrode before use at a temperature of 150-200 ° C for 1-2 hours.

[0018] c. Selection of welding groove: Grind the groove with an angled grinding wheel at the part to be repaired. It should be considered that the groove angle of the groove to be opened should be small, in order to reduce the melting amount of the base metal to reduce the welding stress and weld seam Medium carbon and sulfur content to prevent cracks. The root of the groove should be polished until it has no cracks and is in the shape of a circular arc transition. Harmful impurities such ...

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Abstract

The invention relates to an overlaying welding technology of an iron casting, in particular to an overlaying welding technology of a ductile cast iron roller. The technology comprises the following steps: (1), post-welding preparation: a, detecting cracks; b, controlling a welding material; and c, selecting a welding beveling; (2), welding: a, preheating the beveling within a range of 120mm to 180mm at a temperature range of 130 DEG C to 170 DEG C; b, adopting a DC reverse-connected arc welding machine for welding, using welding rods with the diameter of 3.2mm for welding a first-layer welding line and using welding rods with the diameter of 4mm for welding lines on subsequent layers; and (3), post-welding detection. The invention adopting the technologies, such as small currents, a plurality of stages, sectional welding, welding line hammering after welding, cooling speed reduction, and the like prevents welding line cracks and fusion region cracks from generating, prolongs the service life of products, obtains favorable economic benefits and solves the problems for the overlaying welding of mid-small cracks, and the like on the surface of the ductile cast iron roller.

Description

technical field [0001] The invention relates to a repair welding process for iron castings, in particular to a repair welding process for nodular cast iron rollers. Background technique [0002] When welding ductile iron rollers, cracks are prone to appear, which will seriously affect the quality of welding. There are two situations for the occurrence of cracks: the first is weld cracks, which are mainly due to the fact that the strength of the weld is lower than that of the base metal, and the plasticity is poor, and the cracks are generated under the action of welding stress; the second is cracks in the fusion zone, the main reason is The strength of the weld metal is higher than that of the base metal, and under the action of welding stress, cracks occur along the fusion line. In order to prolong the service life of the product and reduce economic losses, it is necessary to repair the cracked nodular cast iron roller. In view of the poor weldability of this steel type an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/02B23K9/095B23K9/235B23K9/32B23K103/06
Inventor 王且军
Owner CHANGZHOU HAIJIE METALLURGICAL MACHINERY MFG
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