welding crack

In welding process, under arc light, how to photograph the starting and expasion process of weld solidification crack is studied in this paper.

研究了在实际焊接过程中的电弧光下如何拍摄记录焊缝凝固裂纹的启裂和扩展的过程。

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Study on the Crack Genesis and Quality Control for Welding Titanium Equipment

现场施焊钛设备裂纹成因及质量控制研究

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It researches the appearance of thermal crack appeared in the welding process of austenitic stainless steel ( X12CrNiSi1636), and puts forward some new techniques by which applied in production.

对X12CrNiSi1636奥氏体耐热不锈钢在焊接生产过程中极易产生热裂纹的现象进行了深入研究，提出采用变电流焊接、有效控制层间温度以及减小线能量进行焊接的新工艺。并成功应用于生产实践。

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Considerable loss has been caused by delayed crack of tubes which frequently occurred due to directly welding comb sealing plate to T91 tubes in finishing reheater panel of300MW, 600MW boiler.

在300MW、600MW机组锅炉中末级再热器管屏采用梳形密封板直接与T91管子相焊，多次出现管子延时裂缝，给企业造成了很大的损失。

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Based on several years of practice, experiences of welding crack in cast iron box tire and bearing base including choosing of welding agent and welding process are introduced as well as problems need being focused on in operation.

根据多年的实践，作者介绍了手工电弧焊处理铸铁滚圈、铸铁轴承座开裂问题的一些经验，包括焊接材质的选取、焊接工艺的确定以及焊接操作中应注意的问题等。

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The low melting-point eutectic films crack under the welding tensile stress caused by thermal expansion and contraction of magnesium alloy. The formation mechanism of liquefied cracks is similar to crystallization cracks.

液化裂纹的产生机理与焊缝结晶裂纹相似，即同样是在低熔点的液态薄膜的形成和焊接拉应力作用下产生。

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Therefore, it is necessary to reasonably decreasing the cool rate after welding process for improving the ability of anti-fatigue crack initiation in the weld heat affected zone. 5.

因此在焊接时适当地降低热影响区的冷却速度，可以使焊接热影响区获得更优的抗疲劳裂纹萌生能力。

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The crack analysis and the prevention measure for TIG welding of AZ 31 B magnesium alloys were studied.

分析了AZ31B镁合金TIG焊 接头裂纹形成机理,并提出了相应的预防措施.

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Analyzing bucket teeth material and welding crack, the reason was found out.

分析斗齿材质与焊接裂纹的关系, 找出产生裂纹的原因.

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Through the welding crack test of inclined Y groove, physical inspection of mechanical property of welded joint, etc, the steel plate quality and welding process were reviewed as well.

通过斜Y坡口焊接裂纹试验、实物焊接接头的力学性能检验等方法，评价了钢板的质量和焊接工艺。

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On the basis of the effect of the welding linear energy to the behaviours, the mechanism of the thermal crack forming and its development have also been deeply analyzed to provide the theoretical basis to take the technical measures to prevent the weld seams from thermal cracking.

同时在研究焊接线能量对这一规律影响的基础上，对热裂纹的形成和发展机理进行了深入分析，为进一步探索防止焊缝热裂纹的工艺措施提供了重要的理论依据。

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Welding crack and stiffener corrosion are investigated for simple panel structure.

对于简单板架结构，主要考察骨材和带板之间的焊缝裂纹和骨材腐蚀两种损伤。

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The influences of nickel-based alloys spraying layer on the weld crack sensitivity were studied through simulating actual welding experiment in this paper.

通过模拟实际焊接试验，研究了镍基合金喷焊层对焊接裂纹敏感性的影响。

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The results shown that the different zones of butt joints have different fatigue crack propagation rate. The average load, welding residual stress and the microstructures influenced the propagating rate of fatigue crack.

结果表明，焊接接头的不同部位疲劳裂纹扩展速率不同，平均应力、焊接残余应力、金相组织对疲劳裂纹的扩展速率都有一定的影响。

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By analyzing the effect of the material welding capability, welding structure, warm-up, heat treatment after welding and crafts parameter on welding crack in shore crane, the paper put forward the improving measure and acquires favorable result.

从材料的焊接性能、焊接结构、焊条、预热与焊后热处理、焊接工艺参数等角度对岸吊胎架焊缝裂纹进行了分析，提出了改进措施，取得了良好的效果。

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