Paper Title
The Evaluation Of Mechanical Properties For Welded Joints Of Cr-Mo Alloys With Carbon Steels

Abstract
AISI 4130 is a low alloy chromium molybdenum steel and due to lower carbon content than 4140, has improved weldability, machinability. This alloy is widely used to application in oil and gas sector and as aircraft steel. In offshore plant, it applied to the housing of high pressure safety equipment such as well control system. And carbon steels are widely applied to the housing made of 4130 as pipes for delivery of the fluid. In this paper, the mechanical properties for the welded joints of 4130 with carbon steels (ASTM A106 etc.) are evaluated. Tensile tests, micro hardness tests and impact tests are performed to evaluate the mechanical properties. And micro structure of welded joints and after tensile tests fracture plane is observed by using optical microscope, scanning electron microscope (SEM). Through analysis about test results, the integrity of dissimilar welds between 4130 and carbon steels is evaluated. Index Terms�Carbon steel, Dissimilar weld, Low alloy Cr-Mo steel, Mechanical properties