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Method for detecting high-strength steel fillet welding joint performance

A high-strength, fillet weld technology, applied in the direction of strength characteristics, measuring devices, instruments, etc., can solve the problem of no detection method, prevent the generation and expansion of micro-cracks, avoid multi-layer multi-pass welding, applicability strong effect

Active Publication Date: 2009-06-24
LIAONING BUILDING SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still no good detection method for the relationship between groove angle, welding wire matching and number of welds.

Method used

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  • Method for detecting high-strength steel fillet welding joint performance
  • Method for detecting high-strength steel fillet welding joint performance
  • Method for detecting high-strength steel fillet welding joint performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Base material: such as figure 1 As shown, Q550 low-alloy quenched and tempered high-strength steel with a thickness of 20mm is welded to a vertical plate 2 with a height of 45mm on three test plates 1 of 300mm×300mm to form a T-shaped structure. A single V-shaped groove 3 is made at the corner joint between the vertical plate 2 and the test plate 1, and the angles of the three grooves 3 are 25°, 35°, and 45° respectively.

[0030] Welding material: 600MPa gas shielded welding solid wire with a diameter of 1.2mm.

[0031] Welding method: Ar+CO 2 Mixed gas shielded welding, in which Ar and CO 2 The volume percentage is 80%:20%.

[0032] Welding process parameters: welding voltage 28V~29V, welding current 240V~270A, welding speed 0.4cm / s~0.5cm / s, welding heat input 13.4kJ / cm~19.6kJ / cm, shielding gas flow 15~20L / min; Number of welding layers: 3 layers, using multi-layer multi-pass welding; Number of welding passes: 8 passes when the groove angle is 25°, 16 passes when t...

Embodiment 2

[0037] Base material: such as figure 1 As shown, the HQ80 low-alloy high-strength steel with a thickness of 30mm, the vertical plates 2 of the three T-shaped joints are respectively opened with 25°, 35°, and 45° single V-shaped grooves 3, the size of the test plate 1 is 300mm×300mm, the vertical plate 2 The size is 300mm×60mm.

[0038] Welding material: 800MPa gas shielded welding solid wire with a diameter of 1.2mm.

[0039] Welding method: Ar+CO 2 Mixed gas shielded welding, in which Ar and CO 2 The volume percentage is 80%:20%.

[0040]Welding process parameters: welding voltage 27V~28V, welding current 230A~260A, welding speed 0.5cm / s, welding heat input 12.4kJ / cm~14.6kJ / cm, shielding gas flow 16~18L / min, number of welding layers: 3 Layer, using multi-layer multi-pass welding. Number of weld passes: 10 passes when the groove angle is 25°, 21 passes when the groove angle is 35°, and 35 passes when the groove angle is 45°.

[0041] Key points of welding technology: Wel...

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Abstract

The invention relates to a method for testing the performance of a high strength steel fillet welding joint. The method comprises the following steps: 1), test plates of a T-shaped fillet weld are in butt joint with each other, and a single V-shaped groove is formed in the position of the fillet welding joint; 2), the surface of the groove is cleaned up through mechanical treatment before welding; 3), Ar plus CO2 mixed gas shielded arc welding or CO2 gas shielded arc welding is adopted; 4), multi-layer and multi-pass welding is carried out by utilizing solid welding wires, and the welding proceeds without interruption; 5), curved samples are cut off, the lateral surfaces of the samples are leveled through mechanical workout and are bent at an angle of 120 DEG; and 6), the fillet welding areas of the bent samples are subjected to macroscopic or microscopic detection. Compared with the conventional method for detecting the welding joint, the invention can achieve the effects of reliably testing the suitable groove angle of a high strength steel fillet welding joint with the tensile strength of 600-800 MPa, the matching level of welding wires and the crack resistance of the welding joint, avoiding unnecessary multi-layer and multi-pass welding, and greatly reducing the welding cost. The invention has the characteristics of simple operation and superior applicability, and facilitates popularization and application as well as improvement of the production efficiency.

Description

technical field [0001] The invention relates to a method for detecting the performance of welded joints, in particular to a method for detecting the anti-crack performance of fillet welded joints of low-alloy high-strength steel with a tensile strength of 600-800 MPa. Background technique [0002] Low-alloy high-strength steel not only has high strength, but also has good plasticity and toughness. It is not only economical but also can improve the performance of welding products and structures. Therefore, high-strength steel is widely used in welded engineering structures. [0003] In recent years, the progress of metallurgical production technology, especially the application of computer automatic control technology in smelting, rolling and heat treatment, has provided an important technical guarantee for the development of high-strength steel for welding engineering structures. Especially low-alloy high-strength steel with a tensile strength of 600-800MPa has been widely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04G01N3/00
Inventor 李亚江张永兰
Owner LIAONING BUILDING SCI RES INST
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