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Pounding end, hammering method and welded joint using the method

A technology of tipping and hammering, applied in the direction of welding/welding/cutting items, welding equipment, welding equipment, etc., can solve problems such as fatigue notch, fatigue fracture, etc., and achieve the effect of improving fatigue strength

Active Publication Date: 2016-10-05
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the effects of cyclic stresses and welding residual stresses are superimposed, which can lead to fatigue notching and cause fatigue fractures

Method used

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  • Pounding end, hammering method and welded joint using the method
  • Pounding end, hammering method and welded joint using the method
  • Pounding end, hammering method and welded joint using the method

Examples

Experimental program
Comparison scheme
Effect test

example 1）

[0082] The following striking tips were prepared: with a radius of curvature of 4.5 mm at the top in the XZ section (section orthogonal to the direction of movement of the tip) and with a radius of curvature in the YZ section (section in the direction of movement of the tip) 5 mm in length. The following striking tip is also prepared: in the XZ section (section orthogonal to the direction of movement of the tip) having an elliptical arc shape whose major radius is perpendicular to the direction of movement and striking tip The axis directions are both oriented parallel - the major radius is 6 mm and the minor radius is 3 mm, and has a length of 9 mm in the YZ section (the section in the direction of motion of the tip). A hemispherical striking tip having a distal end having a radius of curvature of 1.5 mm was also prepared. Such as Figure 6A As shown, the welding is performed by performing welding (welding line Protective gas 100% CO 2 , Welding current 240 amps - weldin...

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Abstract

According to the present invention, it is possible to improve the fatigue strength of the welded joint portion by hammering by applying a blow using the striking tip to form a striking zone on the weld toe, the distal end of which is at the It has a length from 1 mm to 10 mm in the direction of motion and has an arc shape in a section perpendicular to the direction of motion—the arc shape has a radius of curvature from 1 mm to 10 mm, and the weld toe is formed from the base The area of ​​material to weld metal in which the weld toe is located between the base material and the weld metal.

Description

technical field [0001] The present invention relates to a beating tip and a method of hammering for forming a welded joint suitable for steel structures, such as steel bridges, in which good fatigue properties are required. The present invention aims at improving the fatigue strength of the welded joint by reducing stress concentration by improving the shape of the weld toe. Background technique [0002] In recent years, more and more cases of damage caused by corrosion or fatigue due to the aging of steel bridges have been reported. In order to prevent these situations, it is first necessary to establish a check system. In particular, in the case of fatigue damage, it is not enough to merely reduce the acting external force of passing vehicles and the like; it is also necessary to improve welding quality from the aspects of design and manufacture. [0003] Stress concentration tends to occur when defects such as cracks exist in the weld, resulting in improper shape of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K31/00
CPCB23K31/00B23K33/004B23K2103/04C21D7/04C21D7/06C21D9/50B23K37/00
Inventor 森影康伊木聪崎本隆洋
Owner JFE STEEL CORP
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