外加轴向磁场K-TIG横焊电弧形态及焊缝成形

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中图分类号： TG444+.4

Abstract： Deep penetration K-TIG welding is an eficient welding technology widely used in the manufacturing of medium and thick plates.To investigate the mechanism of magnetic field affcting the arc shape，digital image processng technology was used to study the arc shape under diffrent magnetic field strengths.The results showed that theaxial magnetic field had diferent effects on the upper and lower parts of the arc，with the upper part exhibiting greater stifness than the lower part. Under the same welding parameters，the fluctuation amplitude of the upper arc affected bythe magnetic field was smaller than that of the lower arc，andthe effect of magnetic field strength on the arc exhibited a nonlinear relationship.The K-TIG welding arc belongs to a free arc， and the formed molten pool area is relatively large.In the transverse welding process，the molten pool flows downward due to the efectof gravity，whichaffects the formationof the weld.To solve this problem，a method of using magnetic field to assist in suppressing the downward flow of the molten pool was proposed.By the interaction between theaxial magnetic fieldand the current of the molten pool，an electromagnetic forceopposite to thedirection of gravity was generated to suppress the downward flow of the molten pol. Therefore，the axial magnetic field is suitable for improving the formation of K -TIG transverse welds.

Key words： K -TIG welding；transverse welding;axial magnetic field;arc shape

0前言

钨极惰性气体保护焊（TIG）因其焊接设备简单，焊缝成形良好，在工业领域得到了广泛的应用[1-2]，然而其是自由电弧作为焊接热源，熔透能力有限。（剩余5623字）