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Submerged arc additive manufacturing method for greatly improving low-temperature tenacity of component

A technology of additive manufacturing and submerged arc welding, applied in the field of additive manufacturing, can solve the problems of limited component size, anisotropy of structure and properties, low deposition efficiency, etc., and achieve low temperature impact toughness improvement, large heat input, blocking The effect of molten metal flowing

Inactive Publication Date: 2020-10-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of limited component size, low deposition efficiency, and anisotropic structure and performance existing in the existing additive manufacturing technology. The present invention provides a method for additive manufacturing using a submerged arc heat source, namely buried Arc additive manufacturing, this method not only greatly improves the production efficiency of additive manufacturing, but also when used in the additive manufacturing of steel components, due to the unique endogenous heat treatment effect, it can obtain uniform and fine structure and excellent low temperature impact toughness. product

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  • Submerged arc additive manufacturing method for greatly improving low-temperature tenacity of component
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  • Submerged arc additive manufacturing method for greatly improving low-temperature tenacity of component

Examples

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Embodiment 1

[0031] Embodiment 1: A low-carbon steel part made of submerged arc welding wire.

[0032] This embodiment describes the process of manufacturing low-carbon steel parts through the submerged arc additive manufacturing method described in the present invention. Such as figure 1 As shown, the equipment used includes:

[0033] Wire spool / strip pole, power supply (not shown), flux delivery unit, motor, table and controls.

[0034] Specifically follow the steps below:

[0035] Grind the substrate flat and wipe it clean with absolute ethanol or acetone, and then fix it horizontally on the workbench 6; write the submerged arc additive work program and set specific working parameters through the control system; use the grade GB H08MnA (EM12K) with a diameter of 4.0 The welding wire of mm, the matching flux of OK FLUX 10.62 (AWS A5.17). The working parameters are as follows: the power supply is a DC power supply, the polarity is DC reverse connection, the working current is set to 4...

Embodiment 2

[0043] Embodiment 2: A low-alloy high-strength steel part made by submerged arc welding wire.

[0044] In this embodiment, on the basis of Embodiment 1, the low-carbon steel submerged arc welding wire is replaced with a low-alloy high-strength steel welding wire, and low-alloy high-strength steel components are manufactured. The grade of the low-alloy high-strength steel welding wire used in this embodiment is S3Ni1Mo, the diameter is 4mm, and the grade of matching flux is OK FLUX 10.62 (AWS A5.17). The working parameters are: the power supply is DC power supply, the polarity is DC reverse connection, the working current is set to 500A, the arc voltage is 29V, and the movement speed of the machine head is 0.4m / min. Other steps are the same as in Example 1, and the final component also has a high impact toughness additive component comparable to that of Example 1.

Embodiment 3

[0045] Example 3: Fabrication of a low-carbon steel part in which the substrate is preheated to 300°C and the interlayer temperature of the additive body is kept not lower than 200°C.

[0046] This example is based on Example 1, and the size of the substrate used is 500*500*40. Because the basic size is large and its heat dissipation effect is strong, it is necessary to preheat the substrate at 300°C before starting the additive. Other steps are the same as in Example 1, and the final component also has a high impact toughness additive component comparable to that of Example 1.

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Abstract

The invention discloses a submerged arc additive manufacturing method for greatly improving low-temperature impact tenacity of a component. The submerged arc additive manufacturing method comprises the steps that a submerged arc heat source is adopted as an additive heat source, the whole component and a heating electric arc need to be embedded in soldering flux, and it is guaranteed that the interlayer temperature is not lower than 200 DEG C. The submerged arc heat source is adopted for conducting additive manufacturing on steel, the structure of the whole component is obviously refined due to the unique multiple welding heat cyclically-induced endogenous heat treatment function, the problem about anisotropy is thoroughly solved, and the excellent low-temperature impact tenacity is particularly obtained. Wide application prospects are achieved in rapid manufacturing of a large-wall-thickness complex steel component.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a submerged arc additive manufacturing method capable of greatly improving the low-temperature impact toughness of steel components. Background technique [0002] At present, the common additive manufacturing methods can be divided into three categories: laser additive manufacturing, electron beam additive manufacturing and electric arc additive manufacturing according to the different types of heat sources. Among them, the entire process of laser additive manufacturing needs to be completed in an inert gas shielded chamber, which has defects such as low cladding efficiency, high manufacturing cost, and insufficient density; although electron beam fuse additive manufacturing can greatly improve cladding efficiency, it needs to be processed in a vacuum. Therefore, the processing of large components is also limited; although the cladding efficiency of the conventiona...

Claims

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Application Information

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IPC IPC(8): B23K9/18B23K9/133B23K9/28B23K9/32B33Y10/00B33Y30/00
CPCB23K9/133B23K9/18B23K9/28B23K9/32B33Y10/00B33Y30/00
Inventor 程方杰李宇航
Owner TIANJIN UNIV