Low-alloy high-strength steel welding process

A welding process and high-strength steel technology, applied in welding media, welding equipment, welding equipment and other directions, can solve the problems of late start of research on welding performance of high-strength steel, reduce the impact toughness of weld metal, welding cracks, etc., and solve the problems of welding residual stress, avoid weld cracks, increase the effect of tensile strength

Inactive Publication Date: 2009-01-07
四川航天神坤装备有限公司
View PDF0 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of this, more and more high-strength steel materials are being used as support structure materials. The main structural parts are gradually replaced by high-strength steel plates of different grades with σs of 450-900 MPa 16Mn (σs is 320-350 MPa). The research on the welding performance of steel started relatively late, and the coal machinery plants are more based on experience, basically in the situation of exploring and producing at the same time, due to improper selection of welding process, welding cracks are prone to occur
Moreover, a l

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Base material: Q690 low-alloy high-strength steel, with unilateral 30° grooves for fillet welded joints and 60° V-shaped grooves for butt joints, grinding and removing rust and oil stains within 20mm around the weld seam;

[0019] Using Ar+CO2 mixed gas shielded welding, welding current I=240A, voltage V=25V, mixed gas ratio Ar:CO2=80:20; shielding gas flow rate 20L / min; DC reverse connection;

[0020] Preheating temperature before welding: when the carbon equivalent of steel parts is greater than 0.4, the preheating temperature is 120°C;

[0021] Welding speed: 250mm / min;

[0022] Harbin Welding Institute HS-80 solid welding wire is used for multi-layer and multi-pass welding; the interlayer temperature is kept at 150°C during the welding process, and the temperature is replenished with a preheating spray gun at any time, and the welding line energy is 18KJ / cm;

[0023] After welding, the overall low temperature aging treatment is carried out at a temperature of 300°C...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a technological method for welding low-alloy high-strength steel, which comprises the following steps: a divided edge is formed, a welding area is polished and cleaned, and the strength of welding material is equivalent to that of steel to be welded; Ar+CO2 mixed gas protective welding is adopted, preheating is performed before welding, and the welding speed is 250-300mm/min; a 800MPa solid welding wire is adopted to perform multilayer multirun welding; the interlayer temperature is kept at 150 DEG C plus or minus 20 DEG C during the welding process, a preheating spray gun is used from time to time for temperature compensation, the welding line energy is 16-18KJ/cm, low temperature aging is performed to the whole after welding, and the temperature is 300-400 DEG C. The welding technological method prevents welding cracks from being generated, eliminates residual stress generated during welding large-sized structural members, and serves the purpose that the tensile strength of weld joins equals the tensile strength of parent metal.

Description

technical field [0001] The invention relates to a low-alloy high-strength steel welding process method. Background technique [0002] As one of the main equipment of the fully mechanized mining face, the hydraulic support, with the further improvement of the frame structure and the more advanced design method, the parameters began to develop in the direction of high working resistance and large center distance. With the increase of the working resistance of the support and the increase of the number of durability tests, if the traditional 16Mn and 15MnVN are used to ensure the support strength of the support, only increasing the thickness of the plate will inevitably make the overall weight of the support overweight, which will seriously affect the mine lifting and underground. Transportation and work surface handling all bring great inconvenience. Therefore, in the case of ensuring that the support strength and the total weight of the bracket do not exceed the standard, th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B23K9/16B23K9/095B23K9/23B23K33/00B23K35/38B23K103/04
Inventor 庞季洪陈建先王大椿
Owner 四川航天神坤装备有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap