地磁场对焊枪高度跟踪的影响及减小方法

来源期刊：中南大学学报(自然科学版)2004年第5期

论文作者：朱名日 温佩琳

文章页码：836 - 839

关键词：焊接;地磁场;弱磁传感器;焊枪悬浮高

Key words：welding; geomagnetic field; GMR-sensor; weld-gun altitude-tracking

摘    要：应用地球磁场理论对GMR磁传感器在焊接过程中焊枪的高度跟踪问题进行系统分析与研究。实验结果表明,采用模拟实验方法,对GMR和放大电路分别采用屏蔽和非屏蔽措施,在正常的工作电压、焊枪与工件的垂直高度为5.0 mm以及地磁场Z分量为26 971 nT时,测得地磁场分量Z引起焊枪的高度变化高达5%,即0.3 mm;此外,结合不同纬度地区的地磁分布情况,得出了桂林与满归两地之间因地磁场影响造成的焊枪高度误差也可高达5.5%即0.3 mm以上。从而证明了这种焊枪高度跟踪检测传感器明显地受地磁地影响。为了减小其影响,采用磁法勘探中磁场补偿原理进行补偿,为电弧焊接非接触检测提供了一种新的方法。

Abstract: The weld seam checking and tracking and the relationship between GMR sensor and geomagnetic field are studied. The altitude problem of welding-gun tracking is analyzed for the GMR sensors by the theories of the geomagnetic field. The experimental results show that the altitude change of welding-gun tracking amounts to 5%, nearly 0.3 mm, under conditions of magnetic shield and nonshield for the GMR, and vertical distance of 5.0mm between welding torch and work-piece, and Z component of the geomagnetic field is 26 971 nT. The difference between Guilin and Mangui is above 5.5%, that to say, more than 0.3 mm, because of the differences of the geomagnetic field in the two situations. Therefore it proved that the sensors of height tracing of the welding torch is influenced evidently. To decrease the difference, the principle of the magnetic field compensation of the magnetic exploration is applied, and the anticipated results are gained. So a new method is added to the noncontact welding.