Effect of Metal-Cored Filler Wire on Surface Morphology and Micro-Hardness of Regulated Metal Deposition Welded ASTM A387-Gr.11-Cl.2 Steel Plates

Abstract

Environmental and human-friendly welding is the need of the hour. In this context, this study explores the application of the regulated metal deposition (RMD) technique for ASTM A387-Gr.11-Cl.2 steel plates. To examine the effect of metal-cored filler wire (MCFW), MEGAFIL 237 M was employed during regulated metal deposition (RMD) welding of 6 mm thick ASTM A387-Gr.11-Cl.2 steel plates. The welding was carried out at an optimized current (A) of 100 A, voltage (V) of 13 V, and gas flow rate (GFR) of 21 L/min. Thereafter, the as-welded plates were examined for morphological changes using optical microscopy. Additionally, the micro-hardness of the as-welded plates was measured to make corroboration with the obtained surface morphologies. In addition to this, the as-welded plates were subjected to heat treatment followed by surface morphology and micro-hardness examination. A comparison was made between the as-welded and heat-treated plates for their obtained surface morphologies and microhardness values. During this, it was observed that the weld zone of as-welded plates has a dendritic surface morphology which is very common in fusion-based welding. Similarly, the weld zone of heat-treated plates has a finer and erratic arrangement of martensite. Moreover, the obtained surface morphologies in the weld zone of as-welded and heat-treated plates have been justified by their respective hardness values of 1588.6 HV and 227.3 HV.

An investigation on the suitability of different welding recovery procedures for cold stamping punches in VF800AT steel

“…High-quality weld consumables are vital in tool repair since welds in tool applications need to have different properties such as hardness, toughness, wear resistance, temper resistance, heat-checking resistance, and oxidation [2]. Manufacturers often select three types of consumables in arc welding processes [5,[17][18][19]: solid filler wire, flux-cored filler wire, and metal-cored filler wire. Metal-cored filler wire (MCFW) is relatively new to the welding industry and is more helpful in terms of quality and productivity, as well as being ecologically benign [17].…”

“…Manufacturers often select three types of consumables in arc welding processes [5,[17][18][19]: solid filler wire, flux-cored filler wire, and metal-cored filler wire. Metal-cored filler wire (MCFW) is relatively new to the welding industry and is more helpful in terms of quality and productivity, as well as being ecologically benign [17]. These filler wires are supplied in diameters in the range of 0.9-2.4 mm and employ Ar (>75%) + CO2 shielding gas combination [5,17,18].…”

“…Metal-cored filler wire (MCFW) is relatively new to the welding industry and is more helpful in terms of quality and productivity, as well as being ecologically benign [17]. These filler wires are supplied in diameters in the range of 0.9-2.4 mm and employ Ar (>75%) + CO2 shielding gas combination [5,17,18]. According to Din Bandhu et al [17], MCFW brings together the strengths of solid and flux-cored filler wires, i.e., it combines the fast deposition speed of a flux-cored filler wire with the superior performance of a solid filler wire.…”

Effect of Heat Input on the Microstructure and Mechanical Properties of Local Dry Underwater Welded Duplex Stainless Steel

“…The RMD method is mostly used for pipeline root-pass welding, due to that it can maintain a consistent arc length independent of wire stick-out and yield spatter-free weld. Studies have been made on the surface morphology, microstructure, and mechanical performance of RMD welding of the ASTM A387-11–2 Steel Plates [ 9 , 10 ]. In this study, considering the project requirements and the existing experimental conditions, we use FCAW as the welding method for the underwater local dry welding of duplex stainless steel.…”

Effect of Weld Design of Transition Layer on Microstructure and Properties of Welded Joints of S32304/Q390C Composites

“…In addition, welding residual stress is also the main cause of welding joint failure [25][26][27]. To improve the quality of welded joints of composite materials and better meet the requirements of use, a transition layer weld is usually added between the base layer weld and the cladding layer weld [28]. Nevertheless, the morphology of the transition layer weld affects the microstructure and properties of the welded joint-the microstructure distribution, composition distribution of the weld, and the formation of interfacial low-carbon-content, carbon-enriched layer, and brittle phase are all related to the weld morphology of the transition layer-and then affects the performance of the welded joint.…”