Abstract
The aim of this study is to improve cladding process productivity by high production rate with low dilution process by specifying technique as hot-wire GMAW process. The base metal of carbon steel A516 Gr70 was cladded by austenitic stainless steel 309LSi for creating a buttering layer and stainless steel 308LSi for hot-wire filler for topping a cladding layer in a one-pass run. The studied parameters this experiment consist of the feeding ratio of hot wire feeding speed per GMAW wire feeding speed and travel speed. Welding phenomenon during welding was observed by CCD camera with specifying the optical device to see the appropriate condition. The result showed the hot-wire GMAW cladding process could reduce cycle time 3.5 times compare with conventional FCAW cladding process. Moreover, dilution of this process could decrease lower than 15% with acceptable FN 3 on the top of weld surface. Therefore, single pass cladding process achieved by using this method with low dilution by still keep microstructure capability.
Highlights
Arc welding processes [1, 2] often use cladding process in pressure vessel industry for the economic purpose such as small area or repairing event
The arc current was fixed at 290 ampere with feeding speed at 13 m/min and 20 mm wire extension length used for GMAW process which got the same production rate in width area same as conventional cladding process by FCAW
The hot-wire ratio was the ratio of hot-wire feeding speed (HWfs: m/min) per GMAW feeding speed (GMAWfs: m/min) as shown in an equation (1)
Summary
Arc welding processes [1, 2] often use cladding process in pressure vessel industry for the economic purpose such as small area or repairing event. Flux-cored arc welding (from here use as FCAW) has been used for cladding process since as high productivity and having good arc stability. A clad thickness layer has been desired not over 3 millimeters in case of general acid service for austenitic stainless steel. In reality, buttering layer which was created by the FCAW has a dilution ratio more than 30%. It is necessary for the multi-pass run to get an appropriate microstructure for a service condition. A clad thickness become over 3 millimeters. Productivity is low because it has a long waste time for getting a specified interpass temperature, an interpass cleaning, and grinding
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