Analysis of Weld Bead Parameters of Overlay Deposited on D2 Steel Components by Plasma Transferred Arc (PTA) Process

Abstract

Plasma Transferred Arc (PTA) process is increasingly used in applications where enhancement of wear, corrosion and heat resistance of metals surface is required. The shape of weld bead geometry affected by the PTA welding process parameters is an indication of the quality of the weld. PTA is a versatile method of depositing high-quality metallurgically fused deposits on relatively low cost surfaces. The overlay deposited is an alloy that is hard and more corrosion resistant than counterparts laid down by Gas Tungsten Arc Welding (GTAW) or Oxy Fuel Welding (OFW) processes. Weld deposits are characterized by very low levels of inclusions, oxides, and discontinuities. This process produces smooth deposits that significantly reduce the amount of post weld machining required. Metal-Mechanic industry continuously requires recovering tool steel components subjected to severe wear. The steel known as D2 is considered to be a high carbon, high chromium cold work tool steel. In this research, weld beads were deposited on D2 steel by using PTA process with different parameters as welding current and travel speed using base nickel filler metal. In order to evaluate the metallurgical features on the weld beads/substrate interface a microstructural characterization was performed by using Scanning Electron Microscopy (SEM) and to evaluate the mechanical properties was conducted the wear test.

Influence of Cr and Nb on the Overlay Deposited on D2 Steel by Plasma Transferred Arc Process

“…6 shows the results of the wear test, in this plot can be appreciated the lost volume and the specific ratio. Compared with D2 steel filler metal applied in D2 steel substrate, Ni base filler metal NiCrBSi presented a wear coefficient k lower, and therefore the wear resistance on the surface is improved significantly [13]. This behavior is due to the homogeneous carbide precipitation zone.…”

A comprehensive review on recent developments in materials and technological parameters for plasma transferred arc hardfacing process

“…At the same time cost of the base material is comparatively low, which makes it suitable for the manufacturing of very heavily loaded parts used in the machinery. 25 The base material is the metal on which the deposition of other material, having desired mechanical properties, is to be deposited to enhance the surface conditions of the overall component. It is very evident from various literature that plain carbon steel and alloy steel are normally used to manufacture the structural parts of the equipment.…”

“…At the same time cost of the base material is comparatively low, which makes it suitable for the manufacturing of very heavily loaded parts used in the machinery. 25…”

Metallurgical Characterization of a Weld Bead Coating Applied by the PTA Process on the D2 Tool Steel

“…Weld bead is an important geometric parameter able to define the properties of the hardfaced layer: several studies demonstrated that there is a close relation between the weld bead shape and the quality of the layer [19][20][21]. Considering the different type of equipment, powder mixtures and process parameters, many combinations of the specifications could be used to find an appropriate welding procedure.…”