Hydrogen Effects on Fatigue Life of Welded Austenitic Stainless Steels Evaluated With Hole-Drilled Tubular Specimens

Kagay, Brian; Marchi, Chris San; Pericoli, Vincente; Foulk, James W.

doi:10.1115/pvp2020-21288

Cited by 1 publication

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“…The findings revealed that post-weld heat treatment reduced both circumferential and axial welding residual stresses. Kagay et al [28] investigated the effects of hydrogen on the fatigue life of welded austenitic stainless steels using hole-drilled tubular specimens. Internal hydrogen reduction decreased both the total fatigue life and the fatigue crack start life of the non-welded and welded tubes.…”

Section: Introductionmentioning

confidence: 99%

Parameter Optimization in Orbital TIG Welding of SUS 304 Stainless Steel Pipe

Minh,

Nguyen,

et al. 2023

Metals

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The influence of welding angle, welding current, travel speed, pulse time, and torch height on the geometry, macrostructure, and mechanical properties of Tungsten Inert Gas (TIG) orbital welding on an SUS 304 stainless steel pipe is investigated in this study. The results show that an electrode angle of 45° produces better weld joints than angles of 30°, 60°, 90°, and 120°. Furthermore, the electrode angle of 30° results in an acceptable weld width but a low depth of penetration (DOP) value. Welding current and weld speed have a significant impact on heat dispersion during TIG welding of an SUS 304 stainless steel pipe. The high welding current may result in blow-hole flaws, particularly near the conclusion of the welding process when heat is accumulated. A long torch height of 2 mm causes unevenness in the weld joints because the arc may be distorted when compared to shorter torch height cases. The pulse time of 0.2 s is too lengthy for a low-welding current situation because it will generate a small weld pool. As a result, the weld pool solidification process speeds up, and porosity emerges in the weld bead. A pulse time of 0.1 s results in a better weld joint. To avoid blow-hole creation, the welding current should be gradually reduced during the process. In addition, the Taguchi results demonstrate that the welding current has the greatest effect on the ultimate tensile strength (UTS) value, followed by welding speed, pulse time, electrode angle, and torch height. Furthermore, the ideal parameters for the UTS value are an electrode angle of 45°, a torch height of 2.0 mm, a welding current of 174 A, a welding speed of 72 mm/min, and a pulse time of 0.3 s.

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Section: Introductionmentioning

confidence: 99%