Method and device for welding steel plates

A technology for welding steel plates and steel plates, which is applied in the field of steel arc welding and can solve the problems of easy cracking and high crack sensitivity

Active Publication Date: 2019-07-12
JIMEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of high crack sensitivity and easy cracks in the welded steel plate obtained by the existing steel plate arc welding, and to provide a method of using electric pulses to refine the grain and reduce the weld grain along the thickness direction of the plate. Welding method and device for suppressing cracks that promote the distribution of weld seam grains along the plane orientation of the plate, and realize crack-free welding

Method used

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  • Method and device for welding steel plates
  • Method and device for welding steel plates
  • Method and device for welding steel plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 As shown, put two steel plates to be welded (DH36 steel plates, both with a thickness of 10mm) on the welding platform. 2 For gas shielded welding, the welding current is 140A, the welding voltage is 20-22V, and the welding speed is 200mm / min. Apply a square wave pulse voltage to the weld pool that can generate a pulse electric field that is substantially perpendicular to the line connecting the two steel plates to be welded. After pool crystallization a welded steel plate is obtained. The metallographic structure diagram of the reference welded steel plate that comparative example 1 obtains and the welded steel plate weld seam that embodiment 1 obtains are respectively as follows figure 2 and image 3 shown. From figure 2 and image 3 It can be seen from the comparison that the electric pulse can effectively refine the grain size and reduce the thickness direction of the weld grains (thickness direction such as figure 2 and image 3 shown i...

Embodiment 2

[0037] Such as figure 1 As shown, two steel plates to be welded (CCS-A steel plates for ships, both thickness 8mm) are placed on the welding platform, the surfaces to be welded face each other, and the arc welding power supply is turned on to strike the arc for submerged arc welding. The welding current is 800A, and the welding voltage is The welding speed is 33-35V, the welding speed is 520mm / min, the welding wire (material is H08A) and the steel plate to be welded end are melted to form a molten pool, and the pulse power supply is turned on at the same time to conduct the pulse circuit. A square wave pulse voltage of a pulsed electric field that is substantially vertical to the surface of the steel plate to be welded. The frequency of the square wave pulse voltage is 350 Hz, the pulse width is 50 μs, and the peak voltage is 110 V. After the molten pool is crystallized, a welded steel plate is obtained. From the metallographic structure diagram of the welded steel plate weld...

Embodiment 3

[0039] Such as figure 1 As shown, put two steel plates to be welded (CCS-A steel plates for marine use, both with a thickness of 12mm) on the welding platform. 2 Gas shielded welding, the welding current is 180A, the welding voltage is 28-30V, the welding speed is 300mm / min, the welding wire (material is H08MnSi) and the steel plate to be welded end are melted to form a molten pool, and the pulse power supply is turned on at the same time to conduct the pulse circuit. Apply a square wave pulse voltage to the weld pool that can generate a pulse electric field that is substantially perpendicular to the line connecting the two steel plates to be welded. The frequency of the square wave pulse voltage is 300Hz, the pulse width is 30μs, and the peak voltage is 100V. After pool crystallization a welded steel plate is obtained. From the metallographic structure diagram of the welded steel plate weld, it can be seen that the electric pulse can effectively refine the grain size and re...

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Abstract

The invention belongs to the field of steel arc welding, and discloses a method and a device for welding steel plates. The method for welding the steel plates comprises the following steps in that inthe arc welding process of the steel plates, a pulse voltage is applied to a weld puddle, and the direction of a pulse electric field generated by the pulse voltage is basically perpendicular to a connecting line of to-be-welded surfaces of two steel plates. By adopting the method and the device for welding the steel plates, the grain size can be effectively refined, the plate thickness directionsize of weld joint grains can be reduced, and a specific weld joint crystal orientation topological morphology is constructed so as to inhibit generation of cracks.

Description

technical field [0001] The invention belongs to the field of steel arc welding, and in particular relates to a method and a device for welding steel plates. Background technique [0002] At present, with the increase of the scale of steel structures, high-strength and large-thickness steels are increasingly used in large-scale structures, which can increase the bearing capacity. However, as the strength of steel increases, the strengthening mechanism becomes more complex, and the susceptibility to welding cracks also increases. Among them, welding cracks are the main welding quality problems of large structures. At present, the welding between steel plates usually uses a high-temperature heat source to melt the welding wire and the metal at the joint to form a molten pool between two steel plates to be welded. After the molten pool cools and crystallizes, a weld is formed to connect the two steel plates. connected into a whole. [0003] When the molten pool cools and cryst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/09B23K9/16B23K9/18
CPCB23K9/09B23K9/16B23K9/18
Inventor 陈章兰
Owner JIMEI UNIV
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