The influence of joining technique on the deformation of laser welded T-joints

Wiesława Piekarska,Zbigniew Saternus,Peter Kopas,Milan Sapieta

doi:10.1051/matecconf/201925402011

Wiesława Piekarska, Zbigniew Saternus + Show 2 more

Open Access

https://doi.org/10.1051/matecconf/201925402011

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Abstract

T-joints are often used in large-scale welded constructions. The use of a laser beam for welding allows to create joints using various techniques. Used welding method affects the shape and size of heat affected zone, deformation of welded elements and consequently the quality of the joint. This work concerns the numerical modeling of the size of heat affected zone and welding deformations in T-joint obtained with two different welding techniques: single-side fillet T-joint and butt welded T-joint, called I-core welded joint. Numerical simulations are carried out in the commercial Abaqus FEA software, supplemented by an additional numerical subroutines which enabled the analysis of thermomechanical phenomena occurring in welding process. Mathematical model of a moveable welding source and the description of heat source positioning relative to the edges of the connected elements are described in numerical subroutines. The material parameters of austenitic steel are taken into account. The size of deformations of welded joints are determined as well as the influence of two different joininig techniques of T-joint on the amount of generated welding deformations are analyzed and compared.

Highlights

Joints in the laser welding process are characterized by a small amount of heat introduced into the joint
The welding process due to the deep penetration of the laser beam into the material allows the use of very high welding speeds [3, 4]
The high precision of welds obtained in the laser welding process allows to perform I-core joint type

Summary

Introduction

Laser technology is used in the manufacture of many types of welded joints. T-joint are commonly used in the industry. Joints in the laser welding process are characterized by a small amount of heat introduced into the joint This has a significant impact on its strength properties [2, 3]. The welding process due to the deep penetration of the laser beam into the material allows the use of very high welding speeds [3, 4]. In the case of single-side welding of T-joint [3, 5] or I-core type [6, 7], the additional material is omitted. The high precision of welds obtained in the laser welding process allows to perform I-core joint type. The paper presents numerical analysis of thermomechanical phenomena of the laser welding process of T-joint using various welding techniques. The calculations are performed for two different tee welding techniques using a laser beam In both cases, the same process parameters were used (laser beam power and welding speed). On the basis of the conducted analysis of mechanical phenomena, the stress state in the weld and welding deformations in T-joints are numerically estimated

Finite element model

Thermal analysis

Mechanical analysis

Results and discussion

Conclusions