High-deposition-rate position welding of Al 5083 alloy for spherical-type liquefied natural gas tank

Abstract

High-deposition-rate welding is used in the fabrication of liquefied natural gas tanks from thick aluminium plates because the weld defect generally increases and the productivity decreases with increasing number of passes. In this study, high-deposition-rate gas metal arc welding was implemented in vertical-up and horizontal positions. High deposition was achieved in the vertical-up position by pulse welding using 2.4-mm single wire and 1.6-mm twin wires and in the horizontal position by electromagnetic lifting of the weld pool. The arc stabilities for the applied processes were examined and welding procedures for thick plates were developed. A total of 14 welding passes were required for the vertical-up welding of a 70-mm thick plate by using the conventional 1.6-mm single-wire process, and the fully penetrated welds could be achieved with 8 welding passes by using twin-wire welding. Also, 10 welding passes were required for the horizontal welding of a 35-mm-thick plate by the conventional approach, and 6-pass full-penetration welding was successfully implemented by applying an external electromagnetic field.

Studies on Quality of Joints and Phenomena Therein for Welded Vehicle Components Made of Aluminium Alloy – a Review

“…Gas metal arc welding (GMAW) needs trivial bevel preparation, raising costs [420]. Kim et al] [421] studied multi-pass deposition with GMAW, noticing that it is time-consuming both with the single wire and with the twin wire method. The use of relatively high heat input leads to severe distortions highly limiting the productivity and weld quality obtained with such a method.…”

Raylı Sistem Araçlarında Kullanılan Alüminyum Alaşımlarının Kaynak İşleminde Sıcaklık Dağılımının İki Boyutlu Sayısal Simülasyonu

“…Bunun sağlanabilmesi için aşağıda yer alan tüm denklemler ayrıntlı bir şekilde yazılmıştır. 1<r<rn ve 1<c<cn için ayrıklaştırılmış denklem (7,8,9,12,13,14,17,18…”

“…Yığma oranı, tandem kaynak prosesinde, konvensiyonel gaz altı kaynağına oranla alüminyum kaynağında bir buçuk katına, çelik kaynağında ise iki katına çıkarılabilir [5], [6]. Tandem kaynağı, tek tel yaklaşımına kıyasla kalın alüminyum plakalar için gerekli kaynak paso sayısını yarıya düşürebilir [7]. Tek telli kaynak işlemlerinde, kaynak banyosunun dar olması nedeniyle erken katılaşma ve daha fazla yüzeysel kusur oluşmaktadır [8].…”

Numerical Analysis of Temperature Distribution in Tandem Welding Process

“…Tandem welding can double the rate of deposition in steel welding (Michie, 1999;Goecke et al, 2001) and increase the rate of deposition in aluminum welding by 55% (Lee et al, 2013). When compared to a single wire method, it requires half the welding passes for thick Aluminum plates (Kim et al, 2016). In high speed single-wire welding process, the formation of weld appearance defects is observed due to the premature solidification of liquid metal in low-temperature zone of molten pool (Qin et al, 2021).…”