scholarly journals Double-sided Hybrid Laser-Arc Welding of 25 mm S690QL High Strength Steel

2021 ◽  
Vol 1135 (1) ◽  
pp. 012004
Author(s):  
C Sørensen ◽  
A Nissen ◽  
C Brynning ◽  
J Nielsen ◽  
R Schøn ◽  
...  
Keyword(s):  
Yield Strength ◽  
High Strength Steel ◽  
Arc Welding ◽  
High Efficiency ◽  
Weld Line ◽  
High Strength Steels ◽  
High Strength ◽  
Laser Weld ◽  
Hybrid Laser Arc Welding ◽  
Two Sides

Abstract Hybrid Laser-Arc Welding (HLAW) technique is an enabler for the next generation high efficiency we lding, bu t in dustrial ad option ha s be en li mited du e to pr ocess complexity. Previously documented challenges with root cracks posed by incomplete penetration were significant; h owever, t his w ork p resents s uccessful w eld s amples p repared f rom S 690QL steel welded from two sides with a 16 kW disc laser. Weld travel speeds below 500 mm/min and weld line energies between 1.7 and 1.9 kJ/mm gave sound weld samples, evaluated for yield strength, elongation, hardness and Charpy-V toughness according to DS/EN ISO 10025-6:2004+A1. The results shown here indicate a significant i ncrease i n t he overall e fficiency of but t wel ds in high strength steels and further cement the HLAW process for high strength steels. It is shown that the consecutive nature of the weld procedure led to non-negligible interpass temperatures for the second weld.

Laser and Hybrid Laser-Arc Welding of High Strength Steel N-A-XTRA-70

2016 ◽  
Vol 870 ◽  
pp. 630-635 ◽  
Author(s):  
O. Berdnikova ◽  
V. Pozniakov ◽  
O. Bushma
Keyword(s):  
Mechanical Properties ◽  
Welded Joints ◽  
High Strength Steel ◽  
Arc Welding ◽  
High Strength Steels ◽  
High Strength ◽  
Point Of View ◽  
Flow Sheet ◽  
Hybrid Laser Arc Welding ◽  
Fine Grain

The advantages of laser and hybrid laser-arc welding in production of welded structures from high strength steels are increase of efficiency due to rise of the welding rate by order; significant (3 – 5 times) decrease of heat input; reduction of weld size; receiving of fine grain structures in the welds and the heat affected zone increasing strength of the joint and reducing susceptibility to crack formation. Research of the peculiarities of laser and hybrid processes, their effect on weld formation, revealing the advantages and eliminating the disadvantages of laser and arc constituents of the heat sources are currently the main problems for the production engineers and researchers. Therefore, the aim of the investigation lies in determination of the effect of process mode parameters of the hybrid laser-arc and laser welding in high-strength steel welding on formation of the structure of the welded joint metal as well as the analysis of effect of this structure on their mechanical properties. The investigation was focused on the high-strength steel N-A-XTRA-70 which is widely used in European Union countries for manufacture of critical structures of different designations. A laboratory bench was developed for experiments. It was used for carrying out investigation on the process flow sheet which provided location of a consumable electrode arc at some distance ahead of a laser beam during welding proceeding. The laser irradiation source was Nd:YAG-laser DY 044 of ROFIN company (Germany). For the first time the results of carried investigations allowed determining the process modes of laser and hybrid laser-arc welding for producing quality and sound welded joints of the high-strength steel from the point of view of the structure formation and metal phase composition providing high indices of mechanical properties and crack resistance of the welded joints.

Study on the hybrid laser-arc welding of 3 mm thick high-strength steel with high speed

2018 ◽  
Vol 6 (2) ◽  
pp. 026546 ◽  
Author(s):  
Zhang Peilei ◽  
Gu Siyuan ◽  
Liu Zhengjun ◽  
Yu Zhishui
Keyword(s):  
High Strength Steel ◽  
Arc Welding ◽  
High Speed ◽  
High Strength ◽  
Hybrid Laser Arc Welding

Hybrid laser/arc welding of thick high-strength steel in different configurations

2017 ◽  
Vol 6 (2) ◽  
pp. 176-188 ◽  
Author(s):  
M. Mazar Atabaki ◽  
N. Yazdian ◽  
R. Kovacevic
Keyword(s):  
High Strength Steel ◽  
Arc Welding ◽  
High Strength ◽  
Hybrid Laser Arc Welding

Multi-Pass Route Planning for Thick Plate of Low Alloy High Strength Steel by Double-Sided Double Arc Welding

2012 ◽  
Vol 590 ◽  
pp. 28-34 ◽  
Author(s):  
Cheng Dong Yang ◽  
H.Y. Huang ◽  
H.J. Zhang ◽  
Y.X. Chen ◽  
San Ben Chen
Keyword(s):  
High Strength Steel ◽  
Arc Welding ◽  
Thick Plate ◽  
High Efficiency ◽  
Route Planning ◽  
High Strength ◽  
Welding Parameters ◽  
Welding Torch ◽  
Welding System

Double-sided double arc welding (DSDAW), a high efficiency method for welding thick plate of low alloy high strength steel which does not require back chipping is used in this paper, research on multi-pass route planning for thick plate of low alloy high strength plate by double-sided double arc welding. Firstly, establish a double-sided double arc welding system that can realize thick plate of low alloy high strength steel double-sided double arc welding by double robots. Then, Propose the multi-pass route planning for thick plate of low alloy high strength steel by double-sided double arc welding by means of misplaced welding. According to the welding parameters and the geometry size of groove, plan the layers, the number of beads and the concrete position of the welding torch for each bead. Finally, the welding experiment has been done to verify the effectiveness of multi-pass route planning. The results of welding experiment are approximately agreement with the multi-pass route planning results. The backing weld can get better appearance in the front and guarantee fusion penetration in the back simultaneously. On the basis of the multi-pass welding route planning, good fusion and leveling interface can be obtained after filler passes.

Hybrid laser arc welding of dissimilar TWIP and DP high strength steel weld

2019 ◽  
Vol 39 ◽  
pp. 233-240 ◽  
Author(s):  
Pasquale Russo Spena ◽  
Andrea Angelastro ◽  
Giuseppe Casalino
Keyword(s):  
High Strength Steel ◽  
Arc Welding ◽  
High Strength ◽  
Steel Weld ◽  
Hybrid Laser Arc Welding

scholarly journals The Influence of Hot-Dip Galvanizing on the Mechanical Properties of High-Strength Steels

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5219
Author(s):  
Milan Šmak ◽  
Jaroslav Kubíček ◽  
Jiří Kala ◽  
Kamil Podaný ◽  
Jan Vaněrek
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Chemical Composition ◽  
Yield Strength ◽  
High Strength Steel ◽  
High Strength Steels ◽  
High Strength ◽  
Steel Members ◽  
Different Types ◽  
Standard Quality

Modern high-strength steels achieve their strength exclusively through the manufacturing process, as the chemical composition of these steels is very similar to the composition of standard-quality steels. Typically, hot-dip galvanizing is used to form a protective zinc layer on the steel parts of structures; nonetheless, the material is exposed to high temperatures during the process. With high-strength steels, this can lead to deterioration of the mechanical properties. This study aims to experimentally examine and evaluate the extent of deterioration of the mechanical properties of high-strength-steel members. The effect was studied on specimens made of three different types of steel with the yield strength ranging from 460 to 1250 MPa. For each type of steel, selected mechanical properties—yield strength, tensile strength, and hardness—were determined on specimens with and without hot-dip galvanization, and the obtained results were mutually compared. Our study shows a significant impact of the hot-dip galvanization process on the mechanical properties of some high-strength steels. With the studied types of steel, the yield strength decreased by up to 18%, the tensile strength by up to 13%, and the hardness by up to 55%.

Hybrid laser-arc welding of advanced high-strength steel

2014 ◽  
Vol 214 (12) ◽  
pp. 2823-2833 ◽  
Author(s):  
Wei Liu ◽  
Junjie Ma ◽  
Guang Yang ◽  
Radovan Kovacevic
Keyword(s):  
High Strength Steel ◽  
Arc Welding ◽  
High Strength ◽  
Advanced High Strength Steel ◽  
Hybrid Laser Arc Welding

scholarly journals Laser-arc welding of high-strength steels with yield strength of more than 700 MPa

2015 ◽  
Vol 2015 (10) ◽  
pp. 19-24 ◽  
Author(s):  
V.D. Poznyakov ◽  
◽  
V.D. Shelyagin ◽  
S.L. Zhdanov ◽  
A.A. Maksimenko ◽  
...  
Keyword(s):  
Yield Strength ◽  
Arc Welding ◽  
High Strength Steels ◽  
High Strength

scholarly journals MAG Welding Tests of Modern High Strength Steels with Minimum Yield Strength of 700 MPa

2019 ◽  
Vol 9 (5) ◽  
pp. 1031 ◽  
Author(s):  
Teemu Lahtinen ◽  
Pedro Vilaça ◽  
Pasi Peura ◽  
Saara Mehtonen
Keyword(s):  
Impact Toughness ◽  
Yield Strength ◽  
Tensile Properties ◽  
High Strength Steel ◽  
Weld Zone ◽  
Weld Line ◽  
High Strength ◽  
Tensile Tests ◽  
Steel Plates ◽  
Image Correlation

The modern high strength steel plates have an excellent combination of strength and toughness based on micro-alloying and complex microstructure. Retaining this combination of properties in the weld zone is a major challenge for applications in high-demanding structural construction. This work investigates the weldability of three different modern high strength steel plates, with a thickness of 8 mm. Two of the test materials were produced by a thermo-mechanically controlled process (TMCP) and one by a quenching and tempering method (Q&T). Two-passes MAG (metal active gas) welding was used with four different heat inputs. The tests implemented on all the materials included tensile, hardness profiles (HV5), Charpy-V impact toughness tests, and microstructure analysis using scanning electron microscope (SEM). For one of the TMCP steels, some extended tests were conducted to define how the tensile properties change along the weld line. These tests included tensile tests with digital image correlation (DIC), and 3-point bending tests. The most notable differences in mechanical properties of the welds between the materials were observed in Charpy-V impact toughness tests, mostly at the vicinity of the fusion line, with the Q&T steel more prone to embrittlement of the heat affected zone (HAZ) than the TMCP steels. Microstructural analysis revealed carbide concentration combined with coarse bainitic structures in HAZ of Q&T steel, explaining the more severe embrittlement. During the tensile tests, the DIC measurements have shown a strain localization in the softest region of the HAZ. Increasing the heat input resulted in earlier localization of the strain and less maximum strength. The tensile properties along the weld line were investigated in all welding conditions, and the results emphasize relevant and systematic differences of the yield strength at the transient zones near the start and end of the weld compared with the intermediate stationary domain.

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