A study of arc force, pool depression and weld penetration during gas tungsten arc welding

Journal Article · Sun Aug 01 00:00:00 EDT 1993 · Welding Journal (Miami); (United States)

OSTI ID:6274498

Rokhlin, S I; Guu, A C ^[1]

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1. Ohio State Univ., Columbus, OH (United States). Dept. of Welding Engineering

Weld pool depression, arc force, weld penetration, and their interrelations have been studied as a function of welding current. Pool depression and welding arc force have been measured simultaneously using a recently developed technique. The authors found quadratic dependence of arc force on current, confirming similar findings in previous studies. Pool depression is essentially zero below a threshold level of current (200 A in this experiment) and then increases quadratically with current. A perfectly linear relation between arc force and pool depression was found in the current range from 200 to 350 A, with pool depression onset at about 0.35 g force (0.34 [center dot] 10[sup [minus]2]N). The total surface tension and gravitational forces were calculated, from the measured surface topography, and found to be about five times that required to balance the arc force at 300 A. Thus electromagnetic and hydrodynamic forces must be taken into account to explain the measured levels of pool depression. The relation between weld penetration and pool depression for different welding currents has been established. Three distinct regimes of weld penetration on weld current were found.

• OSTI ID: 6274498
• Journal Information: Welding Journal (Miami); (United States), Vol. 72:8; ISSN 0043-2296
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
GAS TUNGSTEN-ARC WELDING
PERFORMANCE
LIQUID METALS
MELTING
SURFACE TENSION
TOPOGRAPHY
WELDED JOINTS
ARC WELDING
ELEMENTS
FABRICATION
FLUIDS
GAS METAL-ARC WELDING
JOINING
JOINTS
LIQUIDS
METALS
PHASE TRANSFORMATIONS
SURFACE PROPERTIES
WELDING
360101* - Metals & Alloys- Preparation & Fabrication