Iron casting digging-replacement welding repair method

A technology for welding repair and iron castings, applied in welding equipment, welding/welding/cutting items, arc welding equipment, etc. Welding repair and other problems, to achieve the effect of saving ship repair cycle, low production cost and saving money

Inactive Publication Date: 2018-09-04
CSSC GUANGZHOU WENCHONG DOCKYARD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) Severely corroded cast iron will disappear together with the base metal during welding (unable to weld);
[0006] (2) Welded joints are prone to white and hardened structures;
[0007] (3) Welded joints are prone to cracks;
[0008] (4) The cast iron parts that have deteriorated are difficult to weld and cannot be welded
[0009] Small cast iron damage can still be repaired by manual arc welding. When the above-mentioned cast iron equipment of the sh

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The method for digging, welding and repairing iron castings of this embodiment includes the following steps:

[0031] (1) Use plasma cutting to remove the damaged part of the cast iron, and use steel plate to make replacement inserts according to the shape of the removed part, the steel plate is Q235 plate;

[0032] (2) According to the thickness of the steel plate, bevel the cut of the cast iron part and the edge of the replacement insert and polish it cleanly, revealing the new base material;

[0033] (3) Choose a carbon dioxide welding machine, the polarity of the power source is DC reverse connection, the shielding gas of the molten pool is 100% carbon dioxide, and the CHT711 carbon dioxide flux-cored welding wire with a diameter of 1.2mm is selected, and the carbon dioxide protection welding is performed at room temperature. The block is inlaid on the cast iron piece, the welding current is 140 amperes, the voltage is 23 volts, the welding speed is 140 mm / min, and the mol...

Embodiment 2

[0035] The method for digging, welding and repairing iron castings of this embodiment includes the following steps:

[0036] (1) Use plasma cutting to remove the damaged part of the cast iron, and select the steel plate to make a replacement insert according to the shape of the removed part, the steel plate is A plate;

[0037] (2) According to the thickness of the steel plate, bevel the cut of the cast iron part and the edge of the replacement insert and polish it cleanly, revealing the new base material;

[0038] (3) Choose a carbon dioxide welding machine, the polarity of the power supply is DC reverse connection, the shielding gas of the molten pool is 100% carbon dioxide, and the CHT512 carbon dioxide flux-cored welding wire with a diameter of 1.2mm is selected, and carbon dioxide protection welding is performed at room temperature. The block is inlaid on the cast iron piece, the welding current is 160 amperes, the voltage is 25 volts, the welding speed is 160 mm / min, and the mo...

Embodiment 3

[0041] The method for digging, welding and repairing iron castings of this embodiment includes the following steps:

[0042] (1) Use plasma cutting to remove the damaged part of the cast iron, and select the steel plate to make a replacement insert according to the shape of the removed part. The steel plate is an E plate. For cast irons of a specific shape, the original steel plate must be used before cutting. Replace the inserts with shapes and cut them with plasma;

[0043] (2) According to the thickness of the steel plate, bevel the cut of the cast iron part and the edge of the replacement insert and polish it cleanly, revealing the new base material;

[0044] (3) Choose a carbon dioxide welding machine, the polarity of the power supply is DC reverse connection, the shielding gas of the molten pool is 100% carbon dioxide, and the CHT512 carbon dioxide flux-cored welding wire with a diameter of 1.2mm is selected, and carbon dioxide protection welding is performed at room temperatur...

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Abstract

The invention discloses an iron casting digging-replacement welding repair method. The method comprises the following steps that (1) a damaged part of an iron casting is cut off through plasma cutting, and a replacement insert is manufactured through a steel plate according to the shape of the cut part; (2) according to the thickness of the steel plate, a cut iron casting kerf and the edge of thereplacement insert are grooved and ground cleanly, and brand-new base metal is exposed; and (3) carbon dioxide arc welding machine is adopted, power source poles adopt the direct current electrode positive mode, molten pool protection gas is 100% carbon dioxide, a carbon dioxide flux-cored wire is adopted, carbon-dioxide arc welding is conducted at the room temperature, and the replacement insertis connected to the iron casting in an inserted mode. The method is simple in process, convenient to operate, easy in welding and good in fusing performance, through the repair method, the iron casting can be repeatedly used, resources are saved, the ship repair period is shortened, components scrapped due to corrosion and rotting are reduced, cost of shipowners is reduced, and the ship repair cost is reduced.

Description

Technical field [0001] The invention relates to the technical field of welding repair, in particular to a method for excavating and welding repairing iron castings. Background technique [0002] Cast iron is an iron-carbon alloy with a carbon content of more than 2%. Because cast iron has excellent wear resistance, shock absorption, and castability and machinability, cast iron parts are widely used in various equipment components of ships. The main engine is the heart of the ship, and certain parts of the ship’s equipment, such as various pump seats and end covers (main sea water pumps, fire pumps, ballast pumps, jet pumps, oil pumps, etc.), are all components that maintain the “heart” of the ship. It is cast iron. [0003] However, the welding of iron castings is a difficult problem in the industry due to its characteristics. A large number of graphite flakes are distributed inside the cast iron, just like the steel matrix is ​​split by a large number of small cracks, so the st...

Claims

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Application Information

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IPC IPC(8): B23P6/00B23K9/16B23K103/06
CPCB23K9/16B23P6/00
Inventor 黄建伟黄名章陈晓斌胡志铳向继奎王登强唐朝辉
Owner CSSC GUANGZHOU WENCHONG DOCKYARD CO LTD
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