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Automatic welding process for Invar die steel

A technology of automatic welding and mold steel, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems that the production and application have not been fully promoted, and achieve the purpose of overcoming poor fusion between layers, shortening the teaching time before welding, and reducing angular deformation. small effect

Inactive Publication Date: 2016-03-30
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, welding robots or robotic arms such as Panasonic, KUKA, and ABB can already support various swing welding trajectories, but the production and application of this technology has not been fully promoted in China

Method used

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  • Automatic welding process for Invar die steel
  • Automatic welding process for Invar die steel
  • Automatic welding process for Invar die steel

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The welding base material is Invar steel with a Ni content of 35.67%, with a size of 100mm×50mm×19.05mm, a 60° groove, a blunt edge thickness of 1mm, and a spacing of 1.8mm; the welding wire is InvarM93, with a Ni content of 36.20%, and a diameter of 1.2mm. Flexible clamping is adopted, the reserved anti-deformation angle is 2°, and the flow rate of argon-rich atmosphere is 18L / min; the welding equipment is TAWERS-1400 integrated welding special robot produced by Tangshan Panasonic, the welding torch is perpendicular to the workpiece to be welded, and DC positive connection is adopted; Before welding, grind the groove of the workpiece and wipe it with acetone to remove the oxide film and impurities on the surface; after that, teach the welding track and set the parameters. The specific parameters are as follows:

[0033] ●The first layer: straight track, welding current 235A, welding voltage 26.3V, speed 0.35m / min;

[0034] ●Second layer: simple low-speed swing trajecto...

Embodiment 2

[0042] The welding base material is Invar steel with a Ni content of 35.67%, with a size of 250mm×250mm×19.05mm, a 60° groove, a blunt edge thickness of 1mm, and a spacing of 1.6mm; the welding wire is InvarM93, with a Ni content of 36.20%, and a diameter of 1.2mm. Flexible clamping is adopted, the reserved anti-deformation angle is 1.8°, and the flow rate of argon-rich atmosphere is 18L / min; the welding equipment is TAWERS-1400 integrated welding special robot produced by Tangshan Panasonic, the welding wire is tilted forward by 10°, and DC positive connection is adopted; welding The left and right directions alternate with each other; before welding, the groove of the workpiece is polished and wiped with acetone to remove the surface oxide film and impurities; after that, the teaching of the welding track and the setting of parameters are carried out. The specific parameters are:

[0043] ●The first layer: straight track, welding current 240A, welding voltage 27.3V, speed 0.3...

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Abstract

The invention relates to an automatic welding process for Invar die steel. The process comprises the following steps: selecting welding materials; selecting welding equipment; designing the shape of the bevel of an Invar steel thick sheet welding piece and performing the pre-welding preparation; designing the multi-layer single-channel automatic welding path of an Invar steel thick sheet; designing the parameters of the Invar steel thick sheet multi-layer pulse and oscillation MIG automatic welding process. The pulse MIG arc oscillation welding technology is reasonably adopted, and the large-thickness Invar steel special for manufacturing plane composite dies is welded. For the Invar steel with the thickness of 19.05mm, the welding way of five layers and one welding seam for each layer at the relatively low welding current is adopted to obtain good shaping; staggered fish scales are present on the surface of the welding seam and there is no surface defect such as air pores, splash and cracks on the welding seam, and the back of the Invar steel is completely welded; there is no air pore, crack and impurity in the cross section of the welding seam, the welding seam-base material and the welding seams of the adjacent layers are well welded, there is no obvious grain boundary, the impurities in a weld pool can be effectively purified; after the welding process, the angle deformation is obviously reduced, and the pulse oscillation welding technology has good process adaptability to the Invar steel thick plate.

Description

Technical field: [0001] The invention relates to an automatic welding process for thick plates based on a MIG arc welding robot, in particular to an automatic welding process for Invar die steel, which belongs to the technical field of nickel-based alloy welding. Background technique: [0002] Due to its high specific strength and good fatigue performance, composite materials have become one of the basic materials for manufacturing large aircraft, and the preparation technology of composite materials has also become one of the key technologies for developing advanced large aircraft. Aircraft composite parts are mainly hot-pressed in a specific mold, and then the outer surface of the part is generally no longer machined. Therefore, higher requirements are put forward for the mold material: thermal expansion coefficient similar to composite material, temperature change and Good vacuum stability, low manufacturing cost, etc. As a nickel-based alloy containing Ni35-36%, Invar s...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K35/30B23K9/235
CPCB23K9/173B23K9/235B23K35/3066B23K2103/04
Inventor 占小红陈纪城王宇博孟瑶魏艳红李玉博
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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