English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Nitrogen added austenitic stainless steel is a prospective material for the reactor vessels and piping systems primarily due to its good inter granular corrosion resistance along with desired mechanical and fracture mechanics properties. The use of such a material may provide comparatively longer life with enhanced safety of any component requiring higher stress for a rapid crack propagation indicating more resistance to brittle fracture. The austenitic stainless steel being a readily weldable material, the fabrication of its components and structures in various applications is largely carried out by using different welding processes and procedures. However, the quality of weld joints of this class of steel primarily depends upon thermal behavior of the welding processes employed with or without involvement of fluxes. The weld joint is a mechanically heterogeneous body composed of base metal, weld metal and heat affected zone (HAZ). These different regions of the weld joint leads to heterogeneous mechanical and metallurgical properties of the material along with considerable development of harmful tensile residual stresses. These difficulties resulting from heterogeneity of weld get further compounded in case of heat-sensitive materials like austenitic stainless steel (ASS), especially of thick sections, due to its lower thermal conductivity and higher coefficient of thermal expansion in comparison to those observed in structural steel. The considerably low thermal conductivity makes the HAZ of arc weld of ASS more prone to sensitization while its significantly high coefficient of thermal expansion develops considerable stresses in the weld. Hence the proper selection of welding process and procedure by considering efficient energy distribution in the welding arc leading to comparatively low heat built-up in the weld pool is imperative to reduce the amount of damage produced in different zones of weld joint due to heterogeneity in their properties. Such a control in arc characteristics can be primarily achieved by using gas metal arc welding (GMAW) and possibly more appropriately by employing pulsed current gas metal arc welding (P-GMAW) processes. This is because the use of P-GMAW with proper selection of its simultaneously interactive pulse current parameters that includes pulsed current (Ip), base current (Ib), pulse time (tp), pulse off time (tb) and pulse frequency ( f ) may provide a comparatively low heating welding process. The criticality of selection of pulse parameters in this regard is well addressed by considering its summarized influence defined by a hypothetical factor f [(Ib/Ip) f · tb] where, tb [(1/f ) tp]. But hardly any systematic work is reported so far considering the influence of welding processes on characteristics of the weld joint of thick wall pipe of 304LN

Improvement of Weld Characteristics by Variation in Welding Processes and Parameters in Joining of Thick Wall 304LN Stainless Steel Pipe