Bearing steel welding repairing method

A technology of welding repair and welding method, which is applied in the field of welding repair of Chenggang, can solve the problems of prone to white structure cracks, high carbon content of cast iron, and sensitive cooling speed, etc., and achieve novel and reasonable process design, good weld seam, and welding The effect of process stabilization

Inactive Publication Date: 2015-06-03
SHAANXI TIANYUAN MATERIALS PROTECTION TECH
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Problems solved by technology

[0008] Cast iron has high carbon content, many impurities, and has the characteristics of low plasticity, poor weldability, and sensitivity to cooling speed. After welding repair, white structure and cracks are easy to appear

Method used

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with specific embodiments.

[0033] The present invention relates to a steel welding repair method, comprising the following steps:

[0034] (1) Electrode arc welding is adopted;

[0035] (2) The welding material is nickel-based electrode EZNi-1 (Z308) or nickel-iron alloy electrode EZNiFe-1 (Z408);

[0036] (3) Preheat 100~150℃ or no preheat before welding;

[0037] (4) Use small line energy and narrow bead welding operation to reduce the dilution rate and reduce the width of the white layer in the semi-melted zone;

[0038] (5) Take measures such as short section welding, intermittent welding, scattered welding and hammering the weld immediately after welding to reduce welding stress;

[0039] (6) Choose a reasonable welding direction and sequence, master the principle of welding from the part with high stiffness to the part with low stiffness, and when repairing the crack, the welding d...

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Abstract

The invention provides a bearing steel welding repairing method. The method comprises the steps of 1, performing the shielded metal arc welding method; 2, selecting a nickel-based welding rod EZNi-1(Z308) or ferro-nickel alloy welding rod EZNiFe-1(Z408) as the welding material; 3, preheating to be 100 to 150 DEG C or stopping preheating before welding; 4, welding with small wire energy through a narrow welding channel; 5, performing short section welding, discontinuous welding, dispersed welding and hammering a weld joint immediately after welding and other measures; 6, performing sectional welding in the welding direction from the closed crack tail end to the crack opening end during repairing the crack; 7, performing the embedded lump welding repairing method, namely, removing the crack dense part or the part with relatively large welding filling quantity, embedding a low carbon steel plate or other materials with high performance, and changing the distribution position of the weld joint; 8, performing the cutting silk welding method for the welding groove surface, namely, drilling and tapping the groove surface of a base material, pinching a low-carbon-steel screw, and welding with the screw as the center. With the adoption of the method, the obtained weld joint is high in quality and less in defect; the work reliability is high, the operability is high, the welding is stable, and the good weld joint can be obtained.

Description

technical field [0001] The invention relates to the technical field of welding repair, in particular to a welding repair method for Chenggang. Background technique [0002] The welding repair method is a form of work that uses welding technology to repair failed parts. It is called repair welding for repairing the defects of welding parts; it is used to restore the geometry and size of parts, or to obtain special properties on its surface. When metal is fused it becomes surfacing. Welding repair method plays an important role in equipment maintenance and is widely used, so welding repair technology is especially important for equipment maintenance. [0003] Chemical composition of QT600-3 (mass fraction) % [0004] Material C mn Si S P Mg QT600-3 3.56～3.85 0.49～0.70 1.83～2.56 0.016～0.045 0.035～0.058 0.041～0.067 [0005] Mechanical properties of QT600-3 [0006] Material Rm(MPa) ReL(...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00B23K9/00
CPCB23P6/00B23K9/00
Inventor 郭亚洲
Owner SHAANXI TIANYUAN MATERIALS PROTECTION TECH
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