Method for measuring temperature of welding wire for laser hot wire welding

A measurement method, laser technology, applied in laser welding equipment, optical radiation measurement, radiation pyrometry, etc., can solve problems such as difficult emissivity coefficient calibration, strong interference, temperature measurement failure, etc., to achieve safe and simple operation, and eliminate strong interference Effect

Active Publication Date: 2014-02-12
TSINGHUA UNIV
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Problems solved by technology

However, since the welding wire is in motion and the maximum temperature can reach the melting point, it is not suitable for contact temperature measurement using thermocouples; the front end of the welding wire is close to the molten pool, the strong reflection of the laser and the metal vapor above the molten pool strongly interfere with infrar

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  • Method for measuring temperature of welding wire for laser hot wire welding
  • Method for measuring temperature of welding wire for laser hot wire welding
  • Method for measuring temperature of welding wire for laser hot wire welding

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Embodiment Construction

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0021] After research, the applicant found that the temperature of the welding wire entering the molten pool is determined by the obtained resistance heat, and its main control parameters are heating current and wire feeding speed. If the temperature of the preheated wire is too high, it will cause the wire to fuse outside the molten pool, and if the temperature of the preheated wire is too low, the advantages of laser hot wire welding will be lost. A suitable preheating temperature of the wire is a stable, efficient and high-qual...

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Abstract

The invention discloses a method for measuring temperature of a welding wire for laser hot wire welding. The method comprises the following steps: sending the welding wire to a base metal prewelding position at a preset wire feeding speed; heating the welding wire with preset heating current so as to enable the welding wire to generate resistance heat to enable the temperature to be increased; heating a target welding area by pulse laser with preset laser power, wherein the tail end of the welding wire is away from the center of a laser spot in a fixed distance and is heated; measuring the temperature of the welding wire within a light stop gap of the pulse laser. The method for measuring temperature of the welding wire for laser hot wire welding has the advantages of accuracy and reliability.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a method for measuring the temperature of laser hot wire welding wire. Background technique [0002] Laser hot wire welding preheats the welding wire to a certain temperature through resistance heating and then sends it into the molten pool, which improves the stability of the welding process and cladding efficiency, and effectively expands the application of laser welding. Wire temperature measurement is the core technology for controlling wire transition stability and improving filling efficiency in laser hot wire welding. [0003] In the prior art, a temperature measuring probe is used to detect the temperature at the heating terminal of the welding wire to adjust the temperature of the welding wire, and the temperature probe used is a thermocouple or an infrared temperature measuring sensor. However, since the welding wire is in motion and the maximum temperature can reach ...

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Application Information

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IPC IPC(8): B23K37/00G01J5/00
CPCB23K26/702G01J5/00
Inventor 温鹏郑世卿单际国
Owner TSINGHUA UNIV
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