Multi-pass arc welding techniques of 12 mm thick super-duplex stainless steel

Methods Analysis for Phase Measurement in Welded Sample of Superduplex Stainless Steel Uns S32750

“…The result of the color contrast methodology is presented in the Figure 1 and it can be seen that there was no great variation in the ferrite content between the three sections analyzed, (upper, central and lower of the fusion zone) due to the low value of the standard deviation (Base Metal: ± 2,35 and HAZ: ± 1,66). It is also verified that the value of the average percentage of ferrite from HAZ, of the three sections, is very close to the value of the base metal and within the specifications of Petrobras, between 40% and 60% of ferrite [1,4,11,14,15]. The result, using the method described in the ASTM E 562 standard, for counting points, is shown in Table 3.…”

“…The images obtained by the microscope were treated in Photoshop to adjust contrast and brightness, as well as adjusting each grain in the micrograph so that it would be suitable for applying the phase measurement in ImageJ. In the latter, the counting is performed from the threshold adjustment (converts gray or colored images into high contrast black and white images) and then the percentage of black (ferrite) and white (austenite) pixels is counted by the software itself [14].…”

An investigation on girth friction welding of duplex stainless steel pipes

“…Fusion welding of DSS materials commonly lead to a loss of the optimum ferrite to austenite phase balance and the formation of brittle intermetallic phases in the fusion zone (FZ) that are detrimental to the joint toughness. In a recent study, Arun et al [3] examined the GMA, GTA and flux cored arc (FCA) welding of 12 mm thick super duplex stainless steel (SDSS) (SDSS 2507 or UNS S32750) plates. Although the authors could achieve a reasonable phase balance in all the weldments, they reported the unavoidable precipitation of both χ and σ intermetallic phases and substantial degradation in weld joint mechanical properties.…”

Effect of Storage Conditions of Rutile Flux Cored Welding Wires on Properties of Welds

“…Arc welding using FCAW (Flux Cored Arc Welding) is a commonly used alternative to GMAW (Gas Metal Arc Welding) due to higher welding efficiency, penetration depth, better arc stability and relative ease of welding [1][2][3][4]. The area of its application includes, in particular, shipbuilding, construction and machine industry as well as regeneration of machine elements, technical devices, manufacturing and modification of surface layers [5][6][7][8]. A specific area of application includes the use of flux cored wires for underwater welding [9][10][11].…”