0
TECHNICAL PAPERS

A Novel Control Approach for the Droplet Detachment in Rapid Prototyping by 3D Welding

[+] Author and Article Information
Bing Zheng

Harbin Institute of Technology, Harbin 150001, P. R. China

Radovan Kovacevic

Southern Methodist University, Dallas, TX 75275

J. Manuf. Sci. Eng 123(2), 348-355 (Mar 01, 2000) (8 pages) doi:10.1115/1.1345730 History: Received March 01, 1999; Revised March 01, 2000
Copyright © 2001 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Block diagram of experimental system for GMAW of steel
Grahic Jump Location
Schematic of welding current control wave form (a) pure square wave (b) square wave combined with sine wave (c) pure sine wave
Grahic Jump Location
Wave forms for controlling current with the frequency of 50 Hz (a) combination of square wave form with sine wave form for current control (upper current control wave form: 1.5 V/div, lower synchronous monitoring wave form: 5.0 V/div, time base: 2.0 ms/div) (b) pure square wave form for current control (upper current control wave form: 1.5 V/div, lower synchronous monitoring wave form: 5.0 V/div, time base: 10.0 ms/div)
Grahic Jump Location
Images of droplet detachment with frequency of 50 Hz (frame rate: 409 frames/second, i.e., 2.45 ms/frame) (a) combination of square wave form with sine wave form for current control (b) pure square wave form for current control
Grahic Jump Location
Images of droplet detachment with frequency of 25 Hz (frame rate: 409 frames/second, i.e., 2.45 ms/frame) (a) combination of square wave form with sine wave form for current control (b) pure square wave form for current control
Grahic Jump Location
Images of droplet detachment with frequency of 18 Hz (frame rate: 409 frames/second, i.e., 2.45 ms/frame)
Grahic Jump Location
Photos of weld bead with detachment frequency of 18 Hz
Grahic Jump Location
Geometrical sizes of the weld bead versus average welding current (corresponding to the experiments of No. 1-5 in Table 2) (a) weld penetration (b) weld bead width (c) weld bead height • pure square wave form ▪ combined wave form
Grahic Jump Location
Droplet diameter and detachment frequency versus average welding current (for the experiments of No. 1-5 in Table 2) (a) average droplet diameter (b) droplet detachment frequency • pure square wave form ▪ combined wave form
Grahic Jump Location
Cross sections of the weld beads for the experiments of No. 1-5 and No. 8 in Table 2 (a) combined wave form of 50 Hz (b) pure square wave form of 50 Hz (c) combined wave form of 25 Hz (d) pure square wave form of 25 Hz (e) combined wave form of 18 Hz (f ) pure sine wave form of 75 Hz
Grahic Jump Location
Current control wave forms for forced oscillation of droplet with detachment frequency of 50 Hz (a) combination of square wave form with sine wave form for current control (upper current control wave form: 1.5 V/div, lower synchronous monitoring wave form: 5.0 V/div, time base: 5.0 ms/div) (b) pure square wave form for current control (upper current control wave form: 1.5 V/div, lower synchronous monitoring wave form: 5.0 V/div, time base: 10.0 ms/div)
Grahic Jump Location
Images of forced droplet oscillation with detachment frequency of 50 Hz corresponding to Fig. 11 (frame rate: 606 frames/second, i.e., 1.65 ms/frame) (a) combination of square wave form with sine wave form for current control (b) pure square wave form for current control
Grahic Jump Location
Pure sine wave form for current control of forced droplet oscillation (upper current control wave form: 1.5 V/div, lower synchronous monitoring wave form: 5.0 V/div, time base: 20.0 ms/div)
Grahic Jump Location
Images of forced droplet oscillation with detachment frequency of 75.5 Hz corresponding to Fig. 13 (frame rate: 606 frames/second, i.e., 1.65 ms/frame)
Grahic Jump Location
Wave forms for controlling current of the forced droplet resonance oscillation with detachment frequency of 25 Hz (A square wave form is combined with a sine wave form for current control. Upper current control wave form: 1.5 V/div, lower synchronous monitoring wave form: 5.0 V/div, time base: 2.0 ms/div).
Grahic Jump Location
Images of droplet resonance oscillation corresponding to Fig. 15 (frame rate: 595 frames/second, i.e., 1.68 ms/frame)

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In