Role of welding parameters in determining the geometrical appearance of weld pool

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Journal of Engineering Materials and Technology

DOI:https://doi.org/10.1115/1.2805961· OSTI ID:392220

Kovacevic, R; Cao, Z N; Zhang, Y M ^[1]

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1. Univ. of Kentucky, Lexington, KY (United States). Center for Robotics and Manufacturing Systems

A three-dimensional numerical model is developed to describe the fluid flow and heat transfer in weld pools. Both full penetration and free deformation of the top and bottom weld pool surfaces are considered. Temperature distribution and fluid flow field are obtained. In order to analyze the influence of welding parameters on the geometrical appearance of weld pools, a normalized model is developed to characterize the geometrical appearance of weld pools. It is found that welding current can significantly affect the geometrical shape. When welding current increases, the curvature of the pool boundary at the trailing end increases. The effect of the welding speed on the geometrical appearance is slight, although its influence on the pool size is great. In the interest range of arc length (from 1 mm to 4 mm), the arc length can affect both the size and the shape of the weld pool. However, compared with the welding current and speed, its influences are much weaker, GTA welding experiments are performed to verify the validity of the numerical models. The appearance of weld pools was obtained by using machine vision and a high-shutter speed camera. It is found that the calculated results have a good agreement with the experimental ones.

• Sponsoring Organization: USDOE
• OSTI ID: 392220
• Journal Information: Journal of Engineering Materials and Technology, Journal Name: Journal of Engineering Materials and Technology Journal Issue: 4 Vol. 118; ISSN 0094-4289; ISSN JEMTA8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BOUNDARY CONDITIONS
ELECTRIC CURRENTS
FLUID FLOW
GAS TUNGSTEN-ARC WELDING
HEAT TRANSFER
LIQUID METALS
MATHEMATICAL MODELS
SHAPE
STAINLESS STEELS
VELOCITY
VERIFICATION