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Welding repair method for large nodular iron castings

A welding repair and welding method technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve problems such as hot cracks, cold cracks in ductile iron welded joints, etc., achieve high operability, reduce dilution rate, method simple effect

Inactive Publication Date: 2016-03-23
HANSHAN DALI PRECISION MACHINERY
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Problems solved by technology

[0005] 2) Ductile iron welded joints are prone to cold cracks and hot cracks

Method used

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  • Welding repair method for large nodular iron castings
  • Welding repair method for large nodular iron castings
  • Welding repair method for large nodular iron castings

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Embodiment Construction

[0018] A welding repair method for large ductile iron castings, the specific technical scheme is as follows:

[0019] 1. Electrode arc welding is used, and the welding material is nickel-based electrode EZNi-1 (Z308) or nickel-iron alloy electrode EZNiFe-1 (Z408);

[0020] 2. Preheating before welding, the preheating temperature is 120~150℃;

[0021] 3. 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-melting zone;

[0022] 4. Take measures such as short section welding, intermittent welding, scattered welding and hammering the weld immediately after welding to reduce welding stress;

[0023] 5. Choose a reasonable welding direction and sequence. The principle of welding from the part with high rigidity to the part with small rigidity should be mastered. When repairing cracks, the welding direction is segmented welding from the end of the closed crack to the open end of the crack;

[0024...

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Abstract

The invention discloses a welding repair method for large nodular iron castings. A technical solution of the welding repair method is specifically as follows: adopting a shielded metal arc welding method; carrying out preheating before welding; adopting low linear energy and narrow bead welding operations; adopting such measures as short segment welding, intermittent welding and dispersed welding, and immediate hammering on welding seams after welding; selecting reasonable welding direction and order; employing an insert repair welding method; and applying a screw drilled welding method on a welding groove surface. The welding repair method for large nodular iron castings provided by the present invention is simple, high in operability, and capable of effectively repairing large nodular iron castings, thereby reducing economic losses.

Description

technical field [0001] The invention belongs to the field of repairing large ductile iron castings, in particular to a welding repair method for large ductile iron castings. Background technique [0002] Ductile cast iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel. It is based on its excellent performance that it has been successfully used to cast some complex stress, strength, toughness, and wear resistance. Parts with high performance requirements. Ductile iron has rapidly developed into a cast iron material that is second only to gray cast iron and is widely used. The so-called "substituting iron for steel" mainly refers to ductile iron. Spheroidal graphite cast iron is obtained through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially improves plasticity and toughness, thereby obtaining higher strength than carbon steel. [...

Claims

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Application Information

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IPC IPC(8): B23K9/04B23K35/30
CPCB23K9/04B23K35/3033B23K2103/06
Inventor 李伟
Owner HANSHAN DALI PRECISION MACHINERY
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