Fatigue strength assessment of TIG-dressed ultra-high-strength steel fillet weld joints using the 4R method

Fatigue strength assessment of ground fillet-welded joints using 4R method

“…5. The resulting slope parameter was m = 4.86, which is in line with the 4R results obtained in recent studies [30,31]. As the reference stress range represents a mean stress-corrected value, the results of the 4R method cannot directly be compared to the ENS method.…”

“…While this approach was in development, the authors named the 4R method after four 'R'-letter parameters considered in the analysis (applied stress ratio R, material ultimate strength Rm, residual stress σres and weld toe radius r). The applicability of the approach was also verified for variable amplitude loads [28], duplex and super-duplex stainless steel grades [29], and TIG-dressed joints [30,31].…”

Strength Calculation and Equal Load-Carrying-Capacity Design of an Undermatched HSLA Lap Joint under Out-of-Plane Bending

“…The shape optimization of the weld toe is imperative to eliminate the stress concentration caused by the increased weld size (weld reinforcement for a butt joint). A Baud streamline [19], a Neuber catenary curve [20], a Schnack transition curve [21], C. Mattheck stretch triangle [22], an elliptic, and a parabola are possible optimal shapes, which can be obtained by grinding [23] or tungsten argon arc welding (TIG) dressing [24,25]. In this way, the failure mode of an undermatched joint turns to ductile fracture, where the joint is no longer the weakness of welded structure; thus, the effectiveness of the base metal HSLA is fully demonstrated.…”

Effect of angular distortion and axial misalignment on the fatigue strength of welded and ground mild steel cruciform joints

“…Furthermore, an essential aspect related to the fatigue behaviour of the component structure is the analysis of the welding process-induced deformation [7][8][9] and the postweld treatment procedure to as-welded seams. In regard to the latter effect, there are many different methods, such as the post-weld heat finishing [10][11][12], TIG grinding [13][14][15], burr grinding [16][17][18], shot peening [19][20][21], needle/hammer peening [22][23][24], ultrasonic peening treatment [25][26][27], or high-frequency mechanical impact treatment [11,28,29]. The analyses in this work focus on the grinding process using an angle grinder with a flap disc [30][31][32] for the postweld treatment based on the specified framework conditions.…”