Dissertation > Excellent graduate degree dissertation topics show

Study on Character of Low-power Laser+Arc Hybrid Welding

Author: LuoZhiMin
Tutor: LiuLiMing
School: Dalian University of Technology
Course: Materials processing
Keywords: YAG laser arc hybrid welding Laser waveform Downhill welding
CLC: TG456.7
Type: Master's thesis
Year: 2011
Downloads: 95
Quote: 0
Read: Download Dissertation

Abstract


AZ31B magnesium alloy and Q235B low carbon steel, low power YAG laser welding Arc Hybrid characteristics. Excellent weld AZ31B magnesium alloy under conditions of optimized parameters, the use of low-power YAG laser-TIG arc hybrid heat source welding surface of the molding can be good, no spatter, undercut defects. In the same welding speed and TIG parameters conditions, the composite weld penetration depth value of 4.82mm, is about one to four times TIG welding. Observed arc shape TIG welding and hybrid welding process that hybrid welding arc roots appear near the plate compression. 2. Reallocate YAG pulsed laser energy, were studied in a single laser and YAG laser weld penetration in TIG arc hybrid welding of magnesium alloy laser waveform. The results showed that: In the laser welding, when the single pulse in the high pulse part of the pulse width does not exceed 0.2ms, its depth of penetration is greater than the weld penetration depth of the high pulse. Composite welding, when part of the pulse width of a single pulse of high pulse does not exceed 0.4ms penetration greater than no high pulse weld penetration. By adjusting the parameters of arc current, laser power heat source, were studied in single MAG welding and YAG laser MAG arc hybrid welding low-carbon steel in the heat source parameters of welding speed and plate tilt angle of impact. The results showed that: in downhill welding, with the arc current and the increase of the laser power, the critical welding speed and plate critical inclination angle increases; in a single MAG and composite welding, the welding speed and plate inclination angle same trend. 4 by comparison laser arc hybrid welding and single heat source welding tests found that: in a single laser welding, in order to obtain a greater depth of penetration into the high pulses of the pulse width can be set in the laser front end range of the 0.1-0.2ms; composite welding, in order to obtain a greater depth of penetration improved due to the the TIG arc preheating plate, plate absorption of laser, the laser is easier to enter the inside to the bath, and the front end of the so that the laser can be set a high pulse width range as large as the 0.1-0.4ms. Similarly, in a single laser welding, it is possible to increase the depth of penetration with a high pulse of the laser pulse width is 3.0-3.2ms composite welding 3.0-3.4ms. Maintain the arc current, arc voltage, and the single-MAG welding wire stem elongation arc parameters consistent case, in the laser welding of MAG compound, makes the composite welding arc, since the YAG laser join and laser compression action of the arc attract more In order to concentrate greater the critical welding speed can be obtained in order to achieve high-speed welding, and the sheet critical inclination angle is greater.

Related Dissertations

  1. Research on Welding Characteristics of CO2 Laser-GMA Hybrid Welding for Ultra-Low Carbon Bainitic Steel,TG456.7
  2. Process Research on Fiber Laser-MIG Hybrid Welding Medium Thickness Aluminum,TG456.7
  3. Study on Fiber Laser Welding of Aluminum Alloy with Filler Wire,TG456.7
  4. Dissimilar magnesium alloy AZ31 and NZ30K study of laser welding,TG456.7
  5. Study on Technology of Laser-Arc Hybrid Welding for LY12 Aluminum Alloy,TG456.7
  6. Influence of the Weld Line on Numerical Simulation of Tailor-welded Blank Forming Process and Experimental Study,TG456.7
  7. A Research on the Processing of Stainless Steel Welding Using Nd: YAG Laser + GMT Hybrid Heat Source,TG456.7
  8. Simulation on the Keyhole Moving Process of Electron Beam Welding Based on VOF Algorithm,TG456.3
  9. Research on A Z91 Magnesium Alloy YAG Pulsed Laser W eldability,TG456.7
  10. Wrought Magnesium Alloy Welding by Laser Filling Wires and Laser-arc Hybrid Techniques,TG456.7
  11. Study on the Welding Technology and Forming Performance of Multi-gauge High Strength Steel Laser Tailor-welded Blanks,TG456.7
  12. Equivalent Powers of P-GMA to 2 kW Nd: YAG Laser Power for Different Metals and Their Analyses by Numerical Simulation of Welding Temperature Fields,TG456.7
  13. Technology of Tailor-Laser Welded Blanks Aluminum Alloys,TG456.7
  14. Research on Laser-Arc Hybrid Welding Technology of High Strength Steels,TG456.7
  15. Numerical Simulation of Temperature Field and Stress Field of Ti/Steel Dissimilar Metal Duiing Electron Beam Welding,TG456.3
  16. Numerical Simulation of Temperature and Stress and Strain Fields in Laser Multilaye Welding of Mid-Thick Plate,TG456.7
  17. The Exploring of the Simulation of Solidification Microstructure in Electron Beam Welding,TG456.3
  18. Effect of B and La and Ce on Structure and Mechanical Properties of Ti44Al6Nb Alloys,TG456
  19. Study on the Wire Feeder for Underwater Welding and Process Experiment in Underwater Welding,TG456.5
  20. Numerical Simulation of Bilateral Synchronous Laser Beam Welding for T-Joint of Aluminum Alloys,TG456.7
  21. Numerical Simulation of Evolution in Molten Pool of the Electron Beam Welding Ofaluminium Alloy,TG456.3

CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > Special welding > Laser welding
© 2012 www.DissertationTopic.Net  Mobile