Finite element analysis of arc welding

Technical Report · Tue Jan 01 00:00:00 EST 1980

DOI:https://doi.org/10.2172/5691810· OSTI ID:5691810

Friedman, E.

Analytical models of the gas tungsten-arc welding process into finite element computer programs provides a valuable tool for determining the welding thermal cycle, weld bead shape, and penetration characteristics, as well as for evaluating the stresses and distortions generated as a result of the temperature transients. The analysis procedures are applicable to planar or axisymmetric welds with arbitrary cross-sectional geometries, under quasistationary conditions. The method used for determining temperatures features an iteration procedure to accurately account for the latent heat absorbed during melting and liberated during solidification of the weld. By simulating the heat input from the arc to the workpiece by a normal distribution function, temperature transients, weld bead dimensions, and cooling rates are evaluated as functions of both the magnitude and distribution of heat input, weldment geometry, and weld speed (or duration of heating for stationary arcs). Modeling of the welding thermal cycle is a prerequisite to analytical treatments of metallurgical changes in weld metal and heat-affected zone material, residual stresses and distortions, and weld defects. A quasistationary formulation for moving welds enables temperatures to be calculated using a two-dimensional heat conduction computer program. The present limitation of high welding speed can, however, be relaxed without altering the two-dimensional framework of the procedure.

• Research Organization: Bettis Atomic Power Lab. (BAPL), West Mifflin, PA (United States)
• DOE Contract Number: EY-76-C-11-0014
• OSTI ID: 5691810
• Report Number(s): WAPD-TM-1430; TRN: 80-005686
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
GAS TUNGSTEN-ARC WELDING
WELDED JOINTS
STRESS ANALYSIS
COMPUTER CALCULATIONS
COMPUTER CODES
FINITE ELEMENT METHOD
ITERATIVE METHODS
MATHEMATICAL MODELS
TEMPERATURE MEASUREMENT
ARC WELDING
FABRICATION
JOINING
JOINTS
NUMERICAL SOLUTION
WELDING
360101* - Metals & Alloys- Preparation & Fabrication