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Title: Moisture contamination and welding parameter effects on flux cored arc welding diffusible hydrogen

Abstract

Gas metal arc (GMAW) and flux cored arc (FCAW) welding are gas shielded semiautomatic processes widely used for achieving high productivity in steel fabrication. Contamination of the shielding has can occur due to poorly maintained gas distribution systems. Moisture entering as a gas contaminant is a source of hydrogen that can cause delayed cold cracking in welds. Limiting heat-affected zone hardness is one method of controlling cracking. Even this is based on some assumptions about the hydrogen levels in the weld. A study was conducted to investigate the effect of shielding gas moisture contamination and welding parameters on the diffusible hydrogen content of gas shielded flux cored arc welding. The total wire hydrogen of various electrodes was also tested and compared to the diffusible weld hydrogen. An empirical equation has been developed that estimates the diffusible hydrogen in weld metal for gas shielded flux cored arc welding. The equation is suitable for small diameter electrodes and welding parameter ranges commonly used for out-of-position welding. by combining this with the results from the total wire hydrogen tests, it is possible to estimate diffusible hydrogen directly from measured welding parameters, shielding gas dew point, and total hydrogen of the consumable. These equationsmore » are also useful for evaluating the effect of welding procedure variations from known baseline conditions.« less

Authors:
Publication Date:
OSTI Identifier:
115498
Report Number(s):
CONF-9404233-
TRN: 95:002927-0076
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; HYDROGEN; METALLURGICAL EFFECTS; WELDED JOINTS; FRACTURE MECHANICS; HYDROGEN EMBRITTLEMENT; ARC WELDING; GASES; SHIELDING; HARDNESS; HEAT AFFECTED ZONE; CRACK PROPAGATION

Citation Formats

Kiefer, J J. Moisture contamination and welding parameter effects on flux cored arc welding diffusible hydrogen. United States: N. p., 1994. Web.
Kiefer, J J. Moisture contamination and welding parameter effects on flux cored arc welding diffusible hydrogen. United States.
Kiefer, J J. 1994. "Moisture contamination and welding parameter effects on flux cored arc welding diffusible hydrogen". United States.
@article{osti_115498,
title = {Moisture contamination and welding parameter effects on flux cored arc welding diffusible hydrogen},
author = {Kiefer, J J},
abstractNote = {Gas metal arc (GMAW) and flux cored arc (FCAW) welding are gas shielded semiautomatic processes widely used for achieving high productivity in steel fabrication. Contamination of the shielding has can occur due to poorly maintained gas distribution systems. Moisture entering as a gas contaminant is a source of hydrogen that can cause delayed cold cracking in welds. Limiting heat-affected zone hardness is one method of controlling cracking. Even this is based on some assumptions about the hydrogen levels in the weld. A study was conducted to investigate the effect of shielding gas moisture contamination and welding parameters on the diffusible hydrogen content of gas shielded flux cored arc welding. The total wire hydrogen of various electrodes was also tested and compared to the diffusible weld hydrogen. An empirical equation has been developed that estimates the diffusible hydrogen in weld metal for gas shielded flux cored arc welding. The equation is suitable for small diameter electrodes and welding parameter ranges commonly used for out-of-position welding. by combining this with the results from the total wire hydrogen tests, it is possible to estimate diffusible hydrogen directly from measured welding parameters, shielding gas dew point, and total hydrogen of the consumable. These equations are also useful for evaluating the effect of welding procedure variations from known baseline conditions.},
doi = {},
url = {https://www.osti.gov/biblio/115498}, 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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