Technological method for welding low-temperature ductile iron and manganese steel plate

A process method, manganese steel plate technology, applied in welding equipment, welding/welding/cutting articles, manufacturing tools, etc., can solve the problems of slow heating rate and cooling rate, increased brittleness of carbide precipitation, poor shape of weld seam, etc. , to achieve good fusion, energy saving, and good weld shape

Active Publication Date: 2017-01-04
CHANGZHOU HUADE MACHINERY
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The welding performance of ductile iron is poor, and the heating rate and cooling rate are generally required to be slow and uniform to effectively prevent cracks, so preheating is required; but high manganese steel is just the opposite. Due to the serious tendency of hot cracks, if the conventional welding method is used, it will lead to carbide precipitation and brittleness. increase, so high temperature quenching is required
Therefore, welding ball iron and high manganese steel can easily lead to non-fusion of the weld root, or poor shape of the weld after fusion of the weld root, serious tendency of undercut and arc crater cracks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Place a GJS400-18LT plate with a thickness of 20mm horizontally, with Ar and CO with an Ar volume percentage of 97.5% 2 The mixed gas is used as the active shielding gas, and the Mn13 manganese steel plate with a thickness of 5mm is vertically welded to the above-mentioned GJS400-18LT plate plane through the MAG active gas shielded welding process, using a NiFe-1 electrode with a diameter of 1.2mm, and intermittent welding. On the weld seam of intermittent welding, the length of the welding end is 20mm, and the intermittent distance is 40mm.

[0017] The welding machine is Safford DIGIPULS Ⅱ 420, the welding current is 240A, the voltage is 22V, the welding speed is 460mm / min, and the heat input (line energy) is 0.93kJ / mm.

[0018] The weld root of the GJS400-18LT ductile iron-Mn13 manganese steel joint obtained after welding in this example is well fused, the weld shape is well formed, the surface has no cracks, and no pores; the GJS400-18LT low-temperature ductile iron...

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Abstract

The invention belongs to the technical field of welding, and particularly relates to a technological method for welding low-temperature ductile iron and a manganese steel plate. A NiFe-1 welding rod is selected, an MAG shielded welding technology is adopted, a low-temperature ductile iron material and the manganese steel plate are welded together in an intermittent welding manner, and the low-temperature ductile iron material, the manganese steel plate and the welding rod are not preheated before welding and are not subjected to heat treatment after welding. According to the welding technology, weld joint root fusion is good, weld joint appearance molding is good, and the surface is free of cracks and pores; the low-temperature ductile iron material is free of the phenomena of embrittlement and cracking; the quality of the manganese steel plate is not reduced; and energy consumption is reduced.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a process method for welding low-temperature ductile iron and manganese steel plates. Background technique [0002] The welding performance of ductile iron is poor, and the heating rate and cooling rate are generally required to be slow and uniform to effectively prevent cracks, so preheating is required; but high manganese steel is just the opposite. Due to the serious tendency of hot cracks, if the conventional welding method is used, it will lead to carbide precipitation and brittleness. Increase, so high temperature quenching is required. Therefore, welding ball iron and high manganese steel can easily lead to non-fusion of the weld root, or poor weld shape after fusion of the weld root, serious tendency of undercut and arc crater cracks. Contents of the invention [0003] Aiming at the problems in the background technology, the present invention provides a process for we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K9/235B23K103/02B23K101/18
CPCB23K9/173B23K9/235
Inventor 丁杰莫旭梅赵金权谢震滕轩忠
Owner CHANGZHOU HUADE MACHINERY
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