Effect of welding processes and conditions on the microstructure, mechanical properties and corrosion resistance of duplex stainless steel weldments—A review

Influence of microstructure and elemental partitioning on pitting corrosion resistance of duplex stainless steel welding joints

https://cyberleninka.org/article/n/1477609.pdf

Weldability, machinability and surfacing of commercial duplex stainless steel AISI2205 for marine applications – A recent review

Investigation on microstructure evolution and properties of duplex stainless steel joint multi-pass welded by using different methods

Effect of welding processes on microstructural and mechanical properties of dissimilar weldments between conventional austenitic and high nitrogen austenitic stainless steels

Evolution of microstructure and corrosion behavior in 2205 duplex stainless steel GTA-welding joint

The sessile-drop method and high-temperature small-angle x-ray diffraction technique were used to characterize the density of liquid Al–Si alloys with Si content C = 0 to 22 wt%. A distinct abnormal volume expansion of the hyper-eutectic melts was identified just above the liquidus (within TL–Tk) during the heating sequence (h.s.), which is irreversible during the cooling sequence (c.s.). This phenomenon is explained by the segregation of Si atoms from the supersaturated “quasi-eutectic” structure and formation of silicon clusters in the superheated melt. In addition, a pre-peak in the x-ray diffraction spectrum of Al–14% Si melt was observed at 850 °C, which is associated with the silicon clusters. The pre-peak remains when the superheated melt is cooled down to the liquidus (670 °C); this result is in accord with the density measurements.

Origin of the anomalous volume expansion in Al–Si alloys above liquidus

The invention discloses an activated stranded wire welding wire for increasing the penetration depth. The activated stranded wire welding wire is composed of an integrally-stranded multi-strand solid welding wire body, and an active agent with which the gaps of the stranded welding wire body are filled through extrusion. The cross section of the welding wire body is circular, and the diameter of the welding wire body ranges from 1.5 mm to 12.0 mm. The integrally-stranded multi-strand solid welding wire body is formed by stranding the solid welding wire in the middle axis, namely, the central wire, and 4 to 12 strands of solid welding wires around the central wire, namely, the peripheral wires. The active agent is composed of, by mass, 50% to 60% of SiO2, 10% to 20% of TiO2, 10% to 20% of Cr2O3, 0% to 12% of NaF, 0% to 11% of LiF, 0% to 8% of potassium fluozirconate, 0.1% to 1.0% of sodium stearate and 0.1% to 1% of yttrium oxide. The welding wire is large in welding penetration depth, an electric arc is stable, a weld joint is well formed, and the welding wire can have any length, is suitable for continuous automatic welding and can be used for electric arc welding, submerged-arc welding and electroslag welding of gas protection.

Activated stranded wire welding wire for increasing penetration depth

The invention discloses an active stranded wire welding wire capable of reducing spatter lose rate The active stranded wire welding wire comprises a plurality of solid welding wire strands which are integrally stranded, and active agents which are extruded and filled in clearances of the stranded welding wires; the cross section of each welding wire is circular, and each welding wire is 15 to 36mm in diameter; the plurality of solid welding wire strand are prepared by stranding a solid welding wire, namely, a center wire in a medium axis, and 4 to 12 solid welding wire strands, namely, peripheral wires around the center wire; the active agents are prepared by mixing the following materials in parts by mass: 0 to 10 parts of ferrotitanium, 2 to 8 parts of potassium feldspar, 3 to 10 parts of titanium dioxide, 05 to 30 parts of aluminum magnesium alloy powder, 0 to 95 parts of lithium fluoride, 2 to 8 parts of sodium fluoride, 0 to 8 parts of potassium fluozirconate, 0 to 8 parts of sodium fluosilicate, 03 to 10 part of yttrium oxide, 03 to 10 part of cerium oxide, and 01 to 10 part of sodium stearate With the adoption of the active stranded wire welding wire, the welding splash is reduced, and the arc stability is obviously improved; in addition, the welding wire can be of any length, and is applied to continuous automatic welding, and in particular applied to gas-shielded arc welding

Active stranded wire welding wire capable of reducing spatter lose rate

The joint of dissimilar metals between Mo2FeB2-based cermets and 316L stainless steel was welded by gas tungsten arc welding with no fillers. The weldability was investigated by plate rigid restraint cracking test and transverse rupture strength was measured by the three-point bending test. Microstructure of the weld joint was studied with scanning electron microscope, energy-dispersive spectrometer, X-ray diffractometer and differential scanning calorimeter, etc. Corrosion behavior was investigated by the potentiodynamic polarization test. Results revealed that weld solidification cracking susceptibility existed in the fusion zone. Coarse irregular complex ternary boride phase (M3B2) and hypoeutectic microstructure were formed in weld metal (WM). In heat affected zone (HAZ), a small number of M3B2 grains dissolved into the γ-Fe based binder, with growth and coalescence of the remaining M3B2 grains. Microhardness of HAZ increased slightly and WM presented the highest microhardness in the whole joint. Besides, potentiodynamic polarization test showed that WM had a better corrosion resistance than Mo2FeB2-based cermets, which can be attributed to the higher Cr content and relatively homogenous Mo distribution.

Characterization of weldability, microstructure, and corrosion resistance of dissimilar welded joint between Mo 2 FeB 2 -based cermets and 316L stainless steel

Wang Hongquan

Papers

Evolution of microstructure and corrosion behavior in 2205 duplex stainless steel GTA-welding joint

Origin of the anomalous volume expansion in Al–Si alloys above liquidus

Activated stranded wire welding wire for increasing penetration depth

Active stranded wire welding wire capable of reducing spatter lose rate

Characterization of weldability, microstructure, and corrosion resistance of dissimilar welded joint between Mo 2 FeB 2 -based cermets and 316L stainless steel