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分析脚手架表面缺陷的五种检测方法

发布时间:2019-04-28人气:10
下周北京脚手架市场价格将呈小幅调整的态势…脚手架本周北京脚手架市场价格弱势走低。近期美联储可能降息,各国可能采取宽松货币政策,英国无序脱欧等事件频发,使期货市场震荡加剧,钢坯价格先跌后小幅反弹,北京脚手架市场价格弱势走低。市 场成交减弱,下游采购不积极,大户日成交量在100-2000吨左右。低价出货较好,商家报价向下靠拢。目前脚手架厂家资源到…

脚手架表面缺陷的检测方法,主要有以下五种:一电涡流检测.电涡流检测有多种形式,常用的有常规涡流检测、远场涡流检测、多频涡流检测和脉冲涡流检测等,利用电涡流传感器对金属进行感应,脚手架表面不同缺陷类型和形状将产生不同类型的信号。其优点是检测精度高、探测灵敏度高,检测速度快,能检测待检测管材的表面及亚表面,且不受待检测脚手架表面油污等杂质的影响。缺点是易将非缺陷结构判定为缺陷,误检率较高,检测分辨率不容易调整。
There are five main methods to detect the surface defects of square tubes: one is eddy current testing. Eddy current testing has many forms, such as conventional eddy current testing, far-field eddy current testing, multi-frequency eddy current testing and pulse eddy current testing. Using eddy current sensors to induce metal, different types and shapes of defects on square tubes surface will produce different types of signals. It has the advantages of high detection accuracy, high detection sensitivity, fast detection speed, can detect the surface and sub-surface of the pipe to be tested, and is not affected by the impurities such as oil contamination on the surface of the square pipe to be tested. The disadvantage is that it is easy to judge the non-defective structure as a defect, the false detection rate is high, and the detection resolution is not easy to adjust. 二超声波检测
Two-Ultrasound Detection

利用超声波进入物体遇到缺陷时,一部分声波会产生反射,发射和接收器可对反射波进行分析,就能异常精确地测出缺陷来。超声波检测常用于锻件检测,检测探伤灵敏度高,但是不易检查形状复杂的管材,要求被检查的脚手架表面有一定光洁度,并需有耦合剂充填满探头和被检查表面之间的空隙。
When ultrasound enters an object and encounters a defect, a part of the acoustic wave will produce reflection. The transmitter and receiver can analyze the reflected wave, and the defect can be detected abnormally and accurately. Ultrasound detection is often used for forging detection, which has high detection sensitivity, but it is not easy to inspect the pipe with complex shape. It requires that the surface of the inspected square pipe should have a certain degree of smoothness, and the coupling agent should be used to fill the gap between the probe and the inspected surface.

三磁粉法检测
Detection by three magnetic powder method

磁粉法检测的原理是在脚手架材料中实现磁场,根据缺陷处的漏磁场与磁粉的相互作用,当表面和近表面有不连续或缺陷时,则在不连续处或缺陷处磁力线发生局部畸变产生磁极。其优点是设备投资少,可靠性高,具有直观性。缺点是操作成本高,不能对缺陷准确分类,检测速度较低。
The principle of magnetic particle method is to realize magnetic field in square tube material. According to the interaction between leakage magnetic field at defect and magnetic particle, when there is discontinuity or defect on surface or near surface, the magnetic line at discontinuity or defect will distort locally to produce magnetic pole. Its advantages are less investment in equipment, high reliability and intuition. The disadvantage is that the operation cost is high, the defect can not be accurately classified, and the detection speed is low.

四红外线检测
Four Infrared Detection

通过高频感应线圈,在脚手架表面产生感应电流,感应电流会导致缺陷区域消耗更多电能,引起局部温度升高,通过红外线检测局部温度,从而确定缺陷深度。红外线检测一般用于平直表面的缺陷检测,不适合检测表面不平整金属。
Through high frequency induction coil, induction current is generated on the surface of square tube. Induction current will cause more electric energy to be consumed in defect area, causing local temperature to rise. The defect depth can be determined by infrared detection of local temperature. Infrared detection is generally used for flattening surface defect detection, not suitable for detecting surface irregularity metal.

五漏磁检测
Five magnetic flux leakage detection

脚手架的漏磁检测方法和磁粉检测方法非常相似,适用范围、灵敏度和可靠性较磁粉检测方法更强。
The magnetic flux leakage testing method of square tube is very similar to that of magnetic powder testing method, and its application scope, sensitivity and reliability are stronger than that of magnetic powder testing method.


西安脚手架价格或以暂稳运行厂家还是以出货…脚手架西安脚手架市场保持暂稳运行。情绪方面,通过和商家联系得到的反映,今日期盘出现直线上涨趋势,但脚手架厂家还是以出货为主,价格选择不动暂稳运行中。库存方面,大户库存保持在1万吨上下, 中户在4000吨左右,整体库整体一般,脚手架厂家可接纳,表示暂无太大压力;出货方面,脚手架厂家反映出货量显示整体仍属一般,西安脚… 宝鸡脚手架价格暂稳厂家操作上以出货为主脚手架宝鸡脚手架价格暂稳,市场需求一般。目前宝鸡市场中板整体库存0.2万吨左右,各材质规格齐全,受近期外围脚手架市场价格持续下跌影 响,脚手架厂家操作上以出货为主,价格方面也多次作出调整,出让部分利润。当前脚手架厂家出货资源多为前期锁价,近期鲜有向脚手架厂家订货,操作方面偏谨慎。短期内宝鸡市场脚手架价格或偏弱运…
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