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A kind of technological method of welding low-temperature ductile iron and manganese steel plate

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

Active Publication Date: 2019-01-25
CHANGZHOU HUADE MACHINERY
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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

A process method for welding a low-temperature ductile iron and a manganese steel plate, the method comprising: selecting a NiFe-1 welding rod, and using an MAG active gas shielded welding process to weld the low-temperature ductile iron material and the manganese steel plate together in an intermittent welding manner, wherein the low-temperature ductile iron material, the manganese steel plate and the welding rod are neither preheated before welding, nor are they subjected to a heat treatment after welding. The welding process not only results in a good fusion at the root of the weld, a good weld profile formation, no crack on the surface, no blow hole and no embrittlement and crack phenomenon to the low-temperature ductile iron material, but also causes the quality of the manganese steel plate not to be reduced; furthermore, the energy consumption is saved.

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