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Title: Bead tempering effects on flux cored arc welding heat-affected zone hardness

Abstract

Bead tempering is a technique used to control the maximum heat-affected zone (HAZ) hardness in the base metal. Applications have included pressure vessel repairs, pipeline hot tapping, and structural welding. Although this technique can be effective if closely controlled, its use as standard welding practice is questionable because precise control of bead placement is required. Experimental design software was used to define a test matrix to evaluate the effects of base plate carbon equivalent, heat input, and weld fusion line proximity on HAZ softening of flux cored arc welds. Some quantitative limits have been identified for the application of temperbead techniques. The results showed that tempering increased with base metal carbon equivalent and temperbead cooling time. An empirical formula was developed that is useful for estimating the amount of HAZ hardness reduction from the plate chemistry, welding parameters, and temperbead placement. The formula can determine the welding conditions needed to achieve a desired hardness reduction. Temperbead techniques can be effective for reducing HAZ hardness where very close quality control of the bead placement is possible. however, the use of bead tempering to pass welding procedure qualifications for standard production welding should be avoided because the level of close control ismore » usually not practical.« less

Authors:
Publication Date:
OSTI Identifier:
115527
Report Number(s):
CONF-9404233-
TRN: 95:002927-0107
Resource Type:
Conference
Resource Relation:
Conference: 75. American Welding Society (AWS) annual meeting, Philadelphia, PA (United States), 10-15 Apr 1994; Other Information: PBD: 1994; Related Information: Is Part Of 75th Diamond anniversary American Welding Society annual meeting; PB: 273 p.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; HEAT AFFECTED ZONE; TEMPERING; HARDNESS; ARC WELDING; DATA ACQUISITION; PRESSURE VESSELS; TEMPERATURE DEPENDENCE

Citation Formats

Kiefer, J H. Bead tempering effects on flux cored arc welding heat-affected zone hardness. United States: N. p., 1994. Web.
Kiefer, J H. Bead tempering effects on flux cored arc welding heat-affected zone hardness. United States.
Kiefer, J H. 1994. "Bead tempering effects on flux cored arc welding heat-affected zone hardness". United States.
@article{osti_115527,
title = {Bead tempering effects on flux cored arc welding heat-affected zone hardness},
author = {Kiefer, J H},
abstractNote = {Bead tempering is a technique used to control the maximum heat-affected zone (HAZ) hardness in the base metal. Applications have included pressure vessel repairs, pipeline hot tapping, and structural welding. Although this technique can be effective if closely controlled, its use as standard welding practice is questionable because precise control of bead placement is required. Experimental design software was used to define a test matrix to evaluate the effects of base plate carbon equivalent, heat input, and weld fusion line proximity on HAZ softening of flux cored arc welds. Some quantitative limits have been identified for the application of temperbead techniques. The results showed that tempering increased with base metal carbon equivalent and temperbead cooling time. An empirical formula was developed that is useful for estimating the amount of HAZ hardness reduction from the plate chemistry, welding parameters, and temperbead placement. The formula can determine the welding conditions needed to achieve a desired hardness reduction. Temperbead techniques can be effective for reducing HAZ hardness where very close quality control of the bead placement is possible. however, the use of bead tempering to pass welding procedure qualifications for standard production welding should be avoided because the level of close control is usually not practical.},
doi = {},
url = {https://www.osti.gov/biblio/115527}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Dec 31 00:00:00 EST 1994},
month = {Sat Dec 31 00:00:00 EST 1994}
}

Conference:
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