Heat-to-heat variations in gas-tungsten-arc (GTA) weld penetration of austenitic stainless steels

1987 ◽  
Vol 8 (4) ◽  
pp. 409-413 ◽  
Author(s):  
J. I. Leinonen
Keyword(s):  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Weld Penetration ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

scholarly journals Gas Tungsten Arc Welding of AISI 304 Austenitic Stainless Steels

2015 ◽  
Vol V4 (12) ◽  
Author(s):  
Abhirav Mathur ◽  
Md. Areeb Muneer ◽  
S. S. Sricharan ◽  
K. Chandra Shekar ◽  
Keyword(s):  
Stainless Steels ◽  
Arc Welding ◽  
Austenitic Stainless Steels ◽  
Gas Tungsten Arc Welding ◽  
Aisi 304 ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

Hot Cracking Susceptibility in Duplex Stainless Steel Welds

2018 ◽  
Vol 941 ◽  
pp. 679-685
Author(s):  
Kazuyoshi Saida ◽  
Tomo Ogura
Keyword(s):  
Stainless Steels ◽  
Laser Beam Welding ◽  
Austenitic Stainless Steels ◽  
Hot Cracking ◽  
Duplex Stainless Steels ◽  
Solidification Cracking ◽  
Solidification Mode ◽  
Gas Tungsten Arc ◽  
Varestraint Test ◽  
Super Duplex Stainless Steels

The hot cracking (solidification cracking) susceptibility in the weld metals of duplex stainless steels were quantitatively evaluated by Transverse-Varestraint test with gas tungsten arc welding (GTAW) and laser beam welding (LBW). Three kinds of duplex stainless steels (lean, standard and super duplex stainless steels) were used for evaluation. The solidification brittle temperature ranges (BTR) of duplex stainless steels were 58K, 60K and 76K for standard, lean and super duplex stainless steels, respectively, and were comparable to those of austenitic stainless steels with FA solidification mode. The BTRs in LBW were 10-15K lower than those in GTAW for any steels. In order to clarify the governing factors of solidification cracking in duplex stainless steels, the solidification segregation behaviours of alloying and impurity elements were numerically analysed during GTAW and LBW. Although the harmful elements to solidification cracking such as P, S and C were segregated in the residual liquid phase in any joints, the solidification segregation of P, S and C in LBW was inhibited compared with GTAW due to the rapid cooling rate in LBW. It followed that the decreased solidification cracking susceptibility of duplex stainless steels in LBW would be mainly attributed to the suppression of solidification segregation of P, S and C.

Dilution control in gas-tungsten-arc welds involving superaustenitic stainless steels and nickel-based alloys

2001 ◽  
Vol 32 (6) ◽  
pp. 1171-1176 ◽  
Author(s):  
S. W. Banovic ◽  
I. N. DuPont ◽  
A. R. Marder
Keyword(s):  
Stainless Steels ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
Gas Tungsten Arc Welds

scholarly journals Fracture Threshold Measurements of Hydrogen Precharged Stainless Steel Weld Fusion Zones and Heat Affected Zones

2015 ◽  
Author(s):  
Joseph A. Ronevich ◽  
Brian P. Somerday ◽  
Chris W. San Marchi ◽  
Dorian K. Balch
Keyword(s):  
Stainless Steel ◽  
Fusion Zone ◽  
Stainless Steels ◽  
Heat Affected Zone ◽  
Austenitic Stainless Steels ◽  
Hydrogen Gas ◽  
Gas Tungsten Arc ◽  
Hydrogen Assisted Cracking ◽  
Point Bend ◽  
Subcritical Cracking

Austenitic stainless steels are used in hydrogen environments because of their generally accepted resistance to hydrogen embrittlement; however, hydrogen-assisted cracking can occur depending on the microstructures or composition of the stainless steel. One area that has not been well researched is welds and in particular heat affected zones. The goal of this work was to measure the subcritical cracking susceptibility of hydrogen precharged gas tungsten arc (GTA) welds in forged stainless steels (21Cr-6Ni-9Mn and 304L). Welds were fabricated using 308L filler metal to form 21-6-9/308L and 304L/308L weld rings, and subsequently three-point bend specimens were extracted from the fusion zone and heat affected zone and precharged in high-pressure hydrogen gas. Crack growth resistance curves were measured in air for the hydrogen precharged fusion zones and heat affected zones under rising-displacement loading, revealing significant susceptibility to subcritical cracking. Fracture thresholds of 304L/308L welds were lower than 21-6-9/308L welds which was attributed to higher ferrite fractions in 304L/308L since this phase governed the crack path. Fracture thresholds for the heat affected zone were greater than the fusion zone in 21-6-9/308L which is likely due to negligible ferrite in the heat affected zone. Modifications to the weld joint geometry through use of a single-J design were implemented to allow consistent testing of the heat affected zones by propagating the crack parallel to the fusion zone boundary. Despite low hydrogen diffusivity in the austenitic stainless steels, effects of displacement rates were observed and a critical rate was defined to yield lower-bound fracture thresholds.

Weld penetration sensing in pulsed gas tungsten arc welding based on arc voltage

2016 ◽  
Vol 229 ◽  
pp. 520-527 ◽  
Author(s):  
Shiqi Zhang ◽  
Shengsun Hu ◽  
Zhijiang Wang
Keyword(s):  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Weld Penetration ◽  
Arc Voltage ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

Study of the Effect of Active Fluxes in Gas Tungsten Arc Welding

2011 ◽  
Vol 189-193 ◽  
pp. 3579-3582
Author(s):  
Jian Hao ◽  
Zhen Luo ◽  
Xian Zheng Bu ◽  
Jian Wu Zhang
Keyword(s):  
Stainless Steel ◽  
Thin Layer ◽  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Steel Plates ◽  
Angular Distortion ◽  
Deep Penetration ◽  
Weld Penetration ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

In order to investigate the effect of active fluxes on weld penetration, angular distortion and weld morphology in gas tungsten arc welding (GTAW), three types of oxide fluxes-CaO, TiO2and Al2O3-were used in the welding of 5mm think stainless steel plates. Those powders were applied through a thin layer of the flux to produce a bead on plate welds. The results showed that compared with conventional TIG welding, increased weld penetration and reduced angular distortion of the weld piece were obtained with the application of active fluxes. However, the weld morphology was not changed significantly when the powders were coated on the surface of steel. It was also found that each of the powders has a fittest range in penetration increment. Whether the rate of the coating run out of the range, the effects of these active fluxes on the increased weld penetration were not obvious. The CaO flux has a narrow effective range for deep penetration, while the Al2O3powder does have no effect on A-TIG penetration. The mechanism of those different performances has not been found out. According to the investment, the mechanism of active fluxes for the increased weld penetration and reduced angular distortion is related to the contraction of the arc.

Sign in / Sign up

Export Citation Format

Share Document