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Joint shape design method for realizing equal bending bearing of low-match butt-joint joint with base metal

A technology of butt joints and design methods, which is applied in the direction of metal processing equipment, workpiece edge parts, manufacturing tools, etc., can solve the problems of low bending bearing capacity of low matching butt joints

Inactive Publication Date: 2013-06-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a butt joint design method that makes the low matching butt joint and the base metal have equal bending bearing capacity, so as to solve the problem that the bending bearing capacity of the low matching butt joint is lower than that of the base material or the matching joint above equal strength

Method used

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  • Joint shape design method for realizing equal bending bearing of low-match butt-joint joint with base metal
  • Joint shape design method for realizing equal bending bearing of low-match butt-joint joint with base metal
  • Joint shape design method for realizing equal bending bearing of low-match butt-joint joint with base metal

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specific Embodiment approach 1

[0055] Specific implementation mode 1: The joint design method in this implementation mode that enables low-matching butt joints to bear the load according to the strength of the base metal is based on the fact that the central stress concentration factor at the bottom of the weld is equal to the matching ratio of the yield strength of the low-matching joint, and the stress of the weld toe is reduced as much as possible Concentration factor to achieve "equal bending load"; such as figure 2 As shown, in order to reduce the stress concentration at the weld toe, the transition form between the reinforcement and the base metal is a circular arc curve. The shape design method of the weld is:

[0056] Step 1. Calculate the matching ratio of yield strength of low matching joints (The ratio of the yield strength of the weld deposited metal to the yield strength of the base metal):

[0057] (1);

[0058] Design round bar tensile specimens according to tensile ...

specific Embodiment approach 2

[0080] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is:

[0081] Step 3. Determine the half-width of the capping weld bead w :

[0082] Through analysis and calculation, the center of the bottom of the weld is obtained A Point stress concentration factor and weld reinforcement height h 、Half width of cover weld bead w and half plate thickness t The relationship equation between:

[0083] (3);

[0084] According to the equivalent Von Mises stress calculation:

[0085] (7);

[0086] (8);

[0087] (9);

[0088] According to the bending load condition , Substituting formula (2) into formulas (3), (7), (8) and (9), according to the equivalent Von Mises stress calculation, determine the half-width of the capping weld bead that achieves "equal bending load" with the base metal w .

[0089] Step 4. Weld toe radius r The evaluation process of

[0090] Weld...

specific Embodiment approach 3

[0098] Specific implementation mode three: the difference between this implementation mode and specific implementation modes one and two is:

[0099] Step 4: In actual production and processing, select an appropriate grinding wheel to grind the welding toe to reduce the stress concentration factor of the welding toe; the radius of the grinding wheel mentioned here is the welding toe radius r .

[0100] Other steps are the same as those in Embodiments 1 and 2.

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Abstract

The invention provides a joint shape design method for realizing equal bending bearing of low-match butt-joint joint with base metal and relates to a butt-joint joint design method. The method comprises the following steps that 1, the yield strength matching ratio of a low-match joint is calculated; 2, the height h of the welding seam surplus height is obtained through calculation by a material mechanical formula according to the equal bending bearing condition; 3, the cover surface weld pass half width w is determined; 4, the weld toe radius r is determined; and 5, the low-match joint geometrical shape parameter required by the equal bending bearing is obtained according to the solved height h of the welding seam surplus height, the cover surface weld pass half width w and the weld toe radius r. The joint shape design method is suitable for the low-match flat plate butt-joint joint of the X-shaped grooved double-side welding. The high-intensity welding structure can adopt the low-match joint assembly mode. The high-intensity welding adopts the low-match welding joint, the bending bearing capability can be enabled to be not lower than that of the base metal, and in addition, the ductility and toughness and the like are obviously improved through being compared with those of a matched welding joint.

Description

technical field [0001] The invention relates to a design method for a butt joint, in particular to a design method for a joint that can enable a low-matching butt joint to achieve bending load with a parent material or the like. Background technique [0002] When welding high-strength steel, if the welding material is selected according to the "equal matching principle", it is easy to have welding cold cracks, softening and embrittlement of the heat-affected zone, and insufficient weld toughness reserves. The excellent performance of the material cannot be fully utilized. In addition, the types of welding materials that can be selected for high-strength steel welding are limited, and the process performance is not good, which increases the difficulty of obtaining high-quality welded joints. [0003] It is difficult to completely solve these problems from the perspective of adjusting the chemical composition of steel. For the prominent problem of cold cracks in high-strengt...

Claims

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Application Information

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IPC IPC(8): B23K33/00
Inventor 方洪渊王佳杰董志波刘雪松杨建国张敬强王涛刘涛姜斌
Owner HARBIN INST OF TECH
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