Influence of Welding Wire Selection on the Strength and Toughness of Welded Armor Steel Joints*

Abstract

Since MIL-A-46100D high hardness armor steel plates with excellent resistance to penetration exhibit high strength, selecting the proper electrode used in the gas metal arc welding process is particularly important to obtain a weld joint with high quality satisfying the adequate strength and toughness requirements at the same time. Selecting a consumable electrode with a lower strength than the armor material enhances the ductility and the toughness, reduces the risk of cracking in the weld zone, but it may lead to a considerable loss in strength of welded armor steel joints as well. Thus, an optimization of strength and toughness is required in welding high hardness armor steel plates. Within the scope of this study, two different austenitic stainless solid wires, one of which conforms to AWS 5.9 and the other one to AWS 5.28, and two different cored wires conforming to AWS 5.29 standards were analyzed and compared with respect to weld joint strength and toughness. Although weld joints fabricated with solid wires were superior in weld toughness, weld joints with austenitic cored wires exhibited considerably higher tensile strengths without a significant loss in toughness.

A review on the effect of ageing on the ballistic properties of solid gun and rocket propellants

“…The test is influenced by a number of factors including the shape and porosity (loading density) of the propellant as well as the migration of the surface moderant [38]. The conditioning temperature of the propellant, prior to testing, can also have an impact [40,41]. Furthermore, with regards to closed vessel testing, the only parameters which can be determined with certainty from the experimental results are the pressurisation rate (quickness) and the vivacity [35].…”

“…The test is influenced by a number of factors including the shape and porosity (loading density) of the propellant as well as the migration of the surface moderant [38]. The conditioning temperature of the propellant, prior to testing, can also have an impact [40, 41].…”

“…Like for gun propellants, it is important to measure the burning rate of solid rocket propellants, which gives an understanding of the combustion behaviour [40]. The burning rate (r) of solid rocket propellants is defined by Vielle's law and can be influenced by a range of factors including the migration of components and the combustion catalysts used [40].…”

“…Like for gun propellants, it is important to measure the burning rate of solid rocket propellants, which gives an understanding of the combustion behaviour [40]. The burning rate (r) of solid rocket propellants is defined by Vielle's law and can be influenced by a range of factors including the migration of components and the combustion catalysts used [40]. Vielle's law states that the burning rate is proportional to the pressure raised to a power n, known as the pressure exponent of burning rate where α is the constant of proportionality [6] (Equation : $$$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr r_0 = \alpha \, p^n \hfill\cr}}$$$ …”

Effect of welding wire and groove angle on mechanical properties of high strength steel welded joints

“…Besides that, tension testing is used for ascertaining the strength of welded joints. Filler material and groove geometry of weld joints are among the welding parameters which determine the weld strength [18,19].…”