Undermatched Welding of Ultra-High-Strength Steel S1100 with Metal-Cored Wire: Influence of Welding Positions on Mechanical Properties

Tümer, Mustafa; Vallant, Rudolf; Warchomicka, Fernando; Enzinger, Norbert

doi:10.1007/s11665-022-06876-4

Cited by 7 publications

(1 citation statement)

References 37 publications

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“…Thus, martensite and austenite (M/A) constituents occur as necklaces at the boundaries of PAG. Due to its hybrid microstructure, it can cause local stress concentration [44], and there is a probability of forming potential crack initiation sites [45]. Figures 9(a) and (b) show that ICR-CGHAZs with different sizes for W-5 and S-12 joints are generated in multipass welding due to applied welding techniques.…”

Section: Resultsmentioning

confidence: 99%

The effect of heat input in multi-pass GMAW of S960QL UHSS based on weaving and stringer bead procedure on microstructure and mechanical properties of HAZ

Mert,

Gurol,

Tumer

2023

Mater. Res. Express

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Quenched and tempered S960QL (yield strength ≥ 960 MPa) ultra-high strength steel (UHSS) thick plates were joined by multi-pass robotic gas metal arc welding (GMAW) using weaving and stringer bead techniques. The effects of microstructural changes in heat-affected zone (HAZ) of the joint on toughness and hardness were examined. Weaving and stringer bead techniques applied for the multi-pass welding procedure altered average peak temperatures and exposure time to those temperatures. Mechanical properties of HAZ were evaluated by utilizing notch impact and hardness tests, and these results were correlated with microstructural characterizations using optical and scanning electron microscopes. Prior austenite grain (PAG) coarsening occurred because of increased exposure time to peak temperature in coarse-grained HAZ (CGHAZ) of the W-5 (weaving pass) joint. CGHAZs at the face pass, which have not been subjected to a second thermal cycle, have the highest hardness in both joints. Although standard toughness requirements are met in both joints, since HAZ in the S-12 (stringer bead) joint is narrow compared with the one in the W-5 joint, impact toughness values were higher with the S-12 joint due to the locations of the notches of the impact specimens.

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Section: Resultsmentioning

confidence: 99%