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Method for obtaining enhanced fatigue strength in welded metal joints and hammer head for use at cold working

A welding metal, fatigue strength technology, applied in the field of hammerheads used in welded metal joints to obtain enhanced fatigue strength and cold working, can solve problems such as fatigue life improvement

Inactive Publication Date: 2008-07-09
艾贝尔公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the fatigue life can only be improved to a limited extent when the magnitude of the dynamic stress is high

Method used

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  • Method for obtaining enhanced fatigue strength in welded metal joints and hammer head for use at cold working
  • Method for obtaining enhanced fatigue strength in welded metal joints and hammer head for use at cold working
  • Method for obtaining enhanced fatigue strength in welded metal joints and hammer head for use at cold working

Examples

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Embodiment Construction

[0031] Figure 1 shows a part of a pneumatic hammer 1 having a hammer head 2 according to an embodiment of the invention.

[0032] The hammer head 2 is shown in more detail in FIGS. 2 and 3 . The striker 2 is characterized in that it has a slightly convex, elongated contact area or surface 3 , here in the transverse direction with a radius 4 which is smaller than the radius 5 in the length direction. The contact surface for the hammer head against the weld toe (9 in Figure 4) has a smooth rounded shape at each end 6,7. As shown in Figures 2 and 3, the radius 5 of the hammer head in the length direction is greater than twice the radius 4 of the hammer head in the transverse direction, and less than 20 times the radius 4 in the transverse direction. The figures presented here define the preferred ranges. Although not shown in the figures, the contact surface for the peen against the weld toe is advantageously ground to a surface finish of better than Ra 1.2.

[0033] FIG. 4 sh...

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Abstract

A method of obtaining enhanced fatigue strength in welded metal parts and joints comprising a weld toe (9), wherein the weld toe (9) has been cold worked such that a visible and / or measurable of indentation. The cold working is performed by means of a powered hammer head which is slightly convex and has an elongated contact surface (3) in the length direction for contact with the weld toe (9). In this way, the geometry of the weld toe (9) is substantially improved, while post-weld residual stresses are eliminated and beneficial compressive stresses are established.

Description

technical field [0001] The present invention relates to a method of obtaining enhanced fatigue strength in a welded metal joint comprising a weld toe which has been cold worked so as to produce a visible and / or measurable indentation at the weld toe. The invention also relates to a peen for use in cold working of weld toes for obtaining enhanced fatigue strength in welded metal joints and components. Background technique [0002] The fatigue life of welded structures (eg offshore or shipbuilding) is often reduced due to the presence of untreated welds in critical areas. Due to the large amount of heat required during welding, the fatigue life after welding is significantly reduced. This is mainly caused by the residual stress in the transverse direction of the weld toe. The geometry of the weld toe further reduces fatigue life. [0003] The approach to improving the fatigue life of welded structures consists partly of improving the geometry and partly of eliminating resid...

Claims

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Application Information

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IPC IPC(8): C21D7/04B23K31/00B23K
CPCC21D7/04
Inventor A·弗雷德伯格
Owner 艾贝尔公司
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