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Uncoated electric welding electrode for high-chromium cast iron repair welding

A high-chromium cast iron and welding rod technology, applied in welding equipment, welding media, manufacturing tools, etc., can solve the problems of casting defects that cannot be repaired by welding, and achieve the effects of high average hardness, good crack resistance, and good arc stability

Inactive Publication Date: 2012-08-01
天津重钢机械装备股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the casting defects cannot be repaired by welding with the conventional welding repair process method, and can only be scrapped

Method used

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  • Uncoated electric welding electrode for high-chromium cast iron repair welding
  • Uncoated electric welding electrode for high-chromium cast iron repair welding
  • Uncoated electric welding electrode for high-chromium cast iron repair welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The electric welding electrode for repair welding of high chromium cast iron without coating of the present invention has no coating and only a welding core, and the components forming the welding core are shown in Table 1 below. Each component was weighed according to the weight percentage of the components in the following Table 1, and the mixed solution of the above-mentioned components was melted by an intermediate frequency induction furnace for multi-element alloying treatment. According to the required welding rod diameter, use the corresponding welding rod model, and make such as figure 1 and figure 2 As shown in the welding core sand mold, the sprue 1 is located at the top, and the electrode type 2 is below the sprue 1. In this embodiment, it is a high-chromium alloy electrode with a diameter of φ2mmx200mm. The electrode sand mold can be water glass sand carbon dioxide hardened sand mold or For clay sand molds, there is no need to paint in the cavity. The gra...

Embodiment 2

[0027] The procedure of Example 1 was repeated at the levels of components specified in Table 1 below.

Embodiment 3

[0029] The procedure of Example 1 was repeated at the levels of components specified in Table 1 below.

[0030] Table 1. Weld core composition table (wt%) in embodiment 1-3

[0031] Example

[0032] After testing, the performance indicators of high chromium cast iron after welding repair using the welding rods obtained in the above embodiments 1-3 are shown in the following table 2. From the data, it can be seen that the metallographic structure and hardness of the welding repair part of the casting and the casting body is consistent.

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Abstract

The invention discloses an uncoated electric welding electrode for high-chromium cast iron repair welding. The welding electrode does not have a coating and only has a core. The core consists of the following compositions in percent by weight: 2.75-2.85 percent of C, 0.50-0.80 percent of Si, 0.70-0.80 percent of Mn, 28-29 percent of Cr, 0.40-0.60 percent of Ni, 0.40-0.60 percent of Mo, 0.40-0.60 percent of Cu, less than or equal to 0.04 percent of P, less than or equal to 0.04 percent of S and the balance of Fe, wherein the ratio of Cr to C is ranged from 9.8 to 10.5. A medium-frequency induction furnace is used for smelting molten iron, a sodium silicate-bonded sand carbon dioxide hardened sand mould or a clay sand mould is adopted and a gravity or vacuum casting method is adopted for manufacturing. The uncoated electric welding electrode for high-chromium cast iron repair welding has the advantages that the alloying level is high, the welding is facilitated, the element burning loss is low, the level of matching between elementary compositions in deposited metal and base materials is high during metal deposition, the alloy elements are evenly distributed, the deposited layer is not apt to fall off and the difference between the color of the deposited layer and the color of the base materials is small.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to an electric welding electrode for repairing high-chromium cast iron. Background technique [0002] During the welding process of high chromium cast iron, under the impact of thermal stress, the residual austenite on the surface of the casting induces martensite, which causes volume expansion and produces broken cracks. Under internal stress, the cracks at the sharp corners expand until the casting breaks. Due to the conventional method of repair welding, it is difficult to match the structure and performance of the repaired part with the base metal, so that the welded part is easy to fall off due to the low bonding strength between the welding material and the base metal. match. The welding repair part wears rapidly during use, thus forming a source of wear, and the workpiece will fail quickly. Therefore, the casting defect cannot be welded and repaired by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/08B23K35/32
Inventor 张喜忠武斌苏晶
Owner 天津重钢机械装备股份有限公司
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