A Characterization Method of Dimensional Stability after Welding Forming
A technology of dimensional stability and welding forming, which is applied in the direction of welding equipment, elastic testing, machine/structural component testing, etc., can solve problems affecting product performance, long time period, dimensional changes of welded structural parts, etc., and achieve good observation Experimental results, the effect of large residual stress and obvious deformation
Active Publication Date: 2021-11-30
ZHEJIANG UNIV OF TECH
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Problems solved by technology
In practice, residual stress relaxation still occurs leading to dimensional changes in welded structures
thereby affecting product performance
[0005] Usually, because the dimensional change caused by stress relaxation is not obvious enough, the common method of measuring the dimensional change before and after welding of rod or plate samples is prone to large errors, and the time period is long, which is not conducive to characterizing the welded structural parts. Dimensional stability
Method used
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[0030] The present invention will be further described below in conjunction with the accompanying drawings.
[0031] Such as Figure 1-10 As shown, a characterization method of dimensional stability after welding, the specific steps are as follows:
[0032] Step 1: Make two ring-shaped weldments, one large and one small, where the inner diameter of the large weldment is equal to the outer diameter of the small weldment; the thickness of the large weldment is less than one-tenth of the diameter of the small weldment
[0033] Step 2: Sleeve the large weldment over the small weldment and pass CO 2 Gas-shielded welding Weld the large weldment and the small weldment into one body to form a welded sample; welding uses three layers and three passes, and the interlayer temperature is controlled at 200OC.
[0034] Step 3: setting an opening along the radial direction of the welded sample and perpendicular to the surface of the welded sample; wherein the opening adopts the electric di...
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The invention discloses a method for characterizing dimensional stability after welding, which comprises the following steps: 1) making two ring-shaped welded parts, one large and one small, wherein the inner diameter of the large welded part is equal to the outer diameter of the small welded part; 2. ) Set the large welded piece on the small welded piece, and weld the large welded piece and the small welded piece together by welding process, thus forming a welded molded sample; 3) Along the radial direction of the welded molded sample and perpendicular to the surface of the welded molded sample Set the opening; 4) within a fixed time interval, detect the linear distance parameter between two points on the upper surface boundary line circle on both sides of the opening, and detect the deflection change parameter of the welded molded sample; the present invention can be fast, accurate and convenient It is used to detect the dimensional stability of the weldment over time after welding.
Description
technical field [0001] The invention relates to the field of welding technology, in particular to a characterization method for dimensional stability after welding. Background technique [0002] As an important part of advanced manufacturing technology, welding plays a decisive role in industrial production and social development. Welding has a wide range of applications in many industrial structures. For example, transportation tracks, pressure vessels, ships, aerospace, etc. Steel for welded structures accounts for 50-60% of the world's steel mills. [0003] However, in some precision manufacturing fields, high dimensional accuracy is required after welding and good dimensional stability is required after welding. It has a significant impact on the overall accuracy of the machine tool. [0004] Due to the process of concentrated heat input and post-weld cooling; the thermal expansion and contraction of the weld metal is restrained by the cold metal around the weld and ...
Claims
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IPC IPC(8): G01B21/02B23K31/02G01M5/00
CPCB23K31/02G01B21/02G01M5/0041
Inventor 杨建国陈泽余洋王赛冯道臣肖凡
Owner ZHEJIANG UNIV OF TECH