A study of the mechanism of laser welding defects in low

Get Price Now

What is Welding Defects Types,Causes and Remedies

The defect may differ from the desired weld bead shape,size,and intended quality.Welding defects may occur either outside or inside the weld metal.Some of the defects may be allowed if the defects are under permissible limits but other defects such as cracks are never accepted.Types .Welding defects can be classified into two types as What is Laser Welding and How Does it Work? - TWILaser welding is a process used to join together metals or thermoplastics using a laser beam to form a weld.Being such a concentrated heat source,in thin materials laser welding can be carried out at high welding speeds of metres per minute,and in thicker materials can produce narrow,deep welds between square-edged parts.Welding Defects Types,Causes,and Remedies (With PDF)Welding defects are generated in a welding job due to the faulty or poor technique used by the inexperienced or unskilled welder or due to fundamental difficulties in the welding operation.An ideal weld or good weld should be such that adequate fusion exists between the filler metal and edge preparation together with good penetration.

Weld formation mechanism of fiber laser oscillating

Cai and Zhang et al.[14,15] studied laser oscillating welding of high strength steels and low carbon steels,they found that reducing oscillating amplitude and increasing oscillating frequency were beneficial to reducing the porosity tendency,which decreased by 50 %.Deok Choi et al.studied the effect of oscillating laser beam on weld crack Study on weld formation and its mechanism in laser-TIG Jun 21,2018 A study of the mechanism of laser welding defects in low#0183;A series of laser-tungsten inert gas hybrid welding with filler wire experiments were performed on the TA15 titanium alloys to investigate the effect of welding parameters,such as the distance between the axis of the laser beam and the tip of the tungsten electrode (Dla),the defocused distance of the laser beam,and its CO 2 concentration in the shielding gas,on the weld appearanceStudy on weld formation and its mechanism in laser-TIG Jun 21,2018 A study of the mechanism of laser welding defects in low#0183;A series of laser-tungsten inert gas hybrid welding with filler wire experiments were performed on the TA15 titanium alloys to investigate the effect of welding parameters,such as the distance between the axis of the laser beam and the tip of the tungsten electrode (Dla),the defocused distance of the laser beam,and its CO 2 concentration in the shielding gas,on the weld appearance

Study on the shear performance and fracture mechanism of

The influences of the microstructure,defects and stresses distribution on the shear performance of the T-joints are investigated.Furthermore,the dynamic shear process of welded joint based on FE model of laser welding process for 2219 aluminum alloy is simulated to clarify the shear fracture mechanism.Some results are removed in response to a notice of local law requirement.For more information,please see here.Previous123456NextWhat is Laser Welding and How Does it Work? - TWILaser welding is a process used to join together metals or thermoplastics using a laser beam to form a weld.Being such a concentrated heat source,in thin materials laser welding can be carried out at high welding speeds of metres per minute,and in thicker materials can produce narrow,deep welds between square-edged parts.

Prevention of welding defect by side gas flow and its

Jul 18,2002 A study of the mechanism of laser welding defects in low#0183;In the Nd:yttriumaluminumgarnet (YAG) laser welding of thick plates,reduction of porosity and monitoring the keyhole/molten metal behavior are very important issues to assure the high quality welding.The authors applied a side gas flow to prevent the porosity in the bead on plate welding with 6 kW Nd:YAG laser equipment.At the same time,a reflected Ar + laser in the same axis as the Prevention of welding defect by side gas flow and its Jul 18,2002 A study of the mechanism of laser welding defects in low#0183;In the Nd:yttriumaluminumgarnet (YAG) laser welding of thick plates,reduction of porosity and monitoring the keyhole/molten metal behavior are very important issues to assure the high quality welding.The authors applied a side gas flow to prevent the porosity in the bead on plate welding with 6 kW Nd:YAG laser equipment.At the same time,a reflected Ar + laser in the same axis as the Penetration and porosity prevention mechanism in YAG laser The heat input of laser welding was low because of high energy density,which seems to beneficial to improve the fatigue property of Al weld. This study thus discusses mechanisms of pore

Mitigation of porosity defects in fiber laser welding

Feb 01,2020 A study of the mechanism of laser welding defects in low#0183;In this study,laser welding under low vacuum was performed to reduce porosity defects.The porosity distribution in the weld joints made at various reduced ambient pressures was quantitatively evaluated using 3D micro-CT,and the porosity formation and fluid flow at atmosphere and under low vacuum were directly observed using a high-speed Low speed laser welding of aluminium alloys usingThis chapter will focus on fiber laser welding of 7075-T6 because of its predominant use in aircraft components.2.2 Laser Welding Defects in Aluminium Laser welding is one of the most promising metal joining methods because it can provide high productivity,high weld quality,high welding speed,high weld aspect ratio,low heatLaser Welding of Titanium Alloys with Low Internal Similarly,laser powers from 2.9 (Nd:YAG laser welding of 3mm thickness material) to 6.7kW (Yb fibre laser welding of 9.3mm thickness material) have been used.This last point illustrates that a directed gas jet can also be used in conjunction with a Yb fibre laser to produce low internal porosity content welds.

Laser Welding in Orthodontics A Review Study

Figure 1 (a) Schematic of a laser device,where an active medium is surrounded by a cavity,giving source; (b) Mechanism of light; (c) In real optical media,optical amplification can pass through several energy bands,and some of these passages are non-radiative (dashed line).Laser devices are classified according to their active material.Thus,lasers can be divided in these main families Investigation of weld defects in friction-stir welding and Dec 22,2015 A study of the mechanism of laser welding defects in low#0183;The present study attempts to give an overview of the key factors related to the formation of defects in welding methods commonly used with aluminium alloys.First,a concise overview of defects found in friction-stir welding,laser beam welding and arc weldingInvestigation of transport phenomena and defectIn order to optimize the laser welding process and obtain a good quality weld,it is necessary to have a good understanding of the defect formation mechanisms associated with laser welding of zinc-coated steels.Xie and Denney [18] investigated the possibility of using dual laser beams to reduce the weld defects in laser welding of zinc-coated

Investigation of transport phenomena and defect

In order to optimize the laser welding process and obtain a good quality weld,it is necessary to have a good understanding of the defect formation mechanisms associated with laser welding of zinc-coated steels.Xie and Denney [18] investigated the possibility of using dual laser beams to reduce the weld defects in laser welding of zinc-coated Feasibility study of low power fiber laser welding aa20242.Mechanism of the Displacement.Laser Welding under Vacuum A Review.In 2011,Katayama et al.[21] performed a high power disc laser welding experiment on 304 stainless steel and A5052 aluminum using a new chamber for laser welding under vacuum achieved by using rotary pumps.Sound deep single pass weld of 73 mm inElucidation of melt flows and spatter formation mechanisms Jun 10,2015 A study of the mechanism of laser welding defects in low#0183;This study was undertaken to clarify the relationship among the laser-induced plume ejected from the keyhole,the melt flows in the molten pool,and the formation mechanisms of spatters ejected from the molten pool during 10 kW laser welding of a pure titanium plate.High-speed video camera observation results showed that laser-induced plumes occurred at intervals of about 0.5 ms,

Elucidation of melt flows and spatter formation mechanisms

Jun 10,2015 A study of the mechanism of laser welding defects in low#0183;This study was undertaken to clarify the relationship among the laser-induced plume ejected from the keyhole,the melt flows in the molten pool,and the formation mechanisms of spatters ejected from the molten pool during 10 kW laser welding of a pure titanium plate.High-speed video camera observation results showed that laser-induced plumes occurred at intervals of about 0.5 ms,Defect Formation Mechanisms in Selective Laser Melting A Apr 21,2017 A study of the mechanism of laser welding defects in low#0183;Defect formation is a common problem in selective laser melting (SLM).This paper provides a review of defect formation mechanisms in SLM.It summarizes the recent research outcomes on defect findings and classification,analyzes formation mechanisms of the common defects,such as porosities,incomplete fusion holes,and cracks.The paper discusses the effect of the processDefect Formation Mechanisms in Selective Laser Melting A Apr 21,2017 A study of the mechanism of laser welding defects in low#0183;Defect formation is a common problem in selective laser melting (SLM).This paper provides a review of defect formation mechanisms in SLM.It summarizes the recent research outcomes on defect findings and classification,analyzes formation mechanisms of the common defects,such as porosities,incomplete fusion holes,and cracks.The paper discusses the effect of the process

Cited by 9Publish Year 2013Author Fei Yan,Chunming Wang,Yajun Wang,Xiyuan Hu,Tianjiao Wang,Jianmin Li,Guozhu LiWhat are the typical defects in laser welds? - TWI

Laser welding is shielded using an inert gas shield,and if this shielding is not adequate (due to either too high or too low gas flow rate) then porosity can result.Porosity can be a particular problem for laser welds in aluminium caused by hydrogen evolution in the weld metal.Cited by 9Publish Year 2013Author Fei Yan,Chunming Wang,Yajun Wang,Xiyuan Hu,Tianjiao Wang,Jianmin Li,Guozhu LiA study of the mechanism of laser welding defects in low In this paper,we describe experimental laser welding of low-thermal-expansion superalloy GH909.The main welding defects of GH909 by laser in the weld are liquation cracks and porosities,including hydrogen and carbon monoxide porosity.The forming mechanism of laser welding defectsCited by 3Publish Year 2020Author Meng Jiang,Xi Chen,Yanbin Chen,Wang TaoPeople also askWhat are the defects in laser welding?What are the defects in laser welding?The main defects in laser welds in both steel and aluminium are solidification cracking (also called hot cracking or centreline cracking) and porosity.What are the typical defects in laser welds? - TWI

Cited by 1Publish Year 2021Author Hanxuan Huang,Peilei Zhang,Hua Yan,Zhengjun Liu,Zhishui Yu,Di Wu,Haichuan Shi,Yingtao TianPorosity Formation Mechanism and Suppression Procedure

The formation mechanism of weld defect has been studied extensively through experiment method in deep penetration laser welding [10][11][12][13][14][15][16][17][18],but there are fewer researches Characteristics of high-power CO2 laser welding and In the present paper,formation mechanism of the porosity has been investigated in the deep penetration laser welding.20 kW CO2 laser was used to attain the deep penetration in excess of 20 mm Characteristics of high-power CO2 laser welding and (2006).Characteristics of high-power CO2 laser welding and porosity suppression mechanism with nitrogen shielding.Study of high-power laser welding phenomena.Welding International Vol.20,No.2,

Analysis of Laser Micro Welding of Copper-Aluminum

Micro welding of dissimilar metals can meet many performance requirements for modern engineering structures.In this experiment,laser micro welding of copper-aluminum dissimilar metals was conducted with an HWLW-300A energy negative feedback Nd:YAG pulse laser.By using the overlap welding method with copper on aluminum,with the laser energy being distributed unevenly,good weld jointsA study of the mechanism of laser welding defects in low Apr 01,2013 A study of the mechanism of laser welding defects in low#0183;The purpose of this research is to study the forming mechanism of laser welding defects in low thermal expansion superalloy GH909 and explore methodologies to reduce the porosity and cracking in the weld during laser welding in order to obtain a joint with good performance.A Study on Prediction of Weld Geometry in Laser Overlap Oussaid,K.and El Ouafi,A.(2019) A Study on Prediction of Weld Geometry in Laser Overlap Welding of Low Carbon Galvanized Steel Using ANN-Based Models.Journal of Software Engineering and Applications,12,509-523.doi 10.4236/jsea.2019.1212031.

12345NextA Study on Prediction of Weld Geometry in Laser Overlap

Oussaid,K.and El Ouafi,A.(2019) A Study on Prediction of Weld Geometry in Laser Overlap Welding of Low Carbon Galvanized Steel Using ANN-Based Models.Journal of Software Engineering and Applications,12,509-523.doi 10.4236/jsea.2019.1212031.(PDF) Weld formation mechanism of fiber laser oscillating PDF On May 1,2015,Kangda Hao and others published Weld formation mechanism of fiber laser oscillating welding of austenitic stainless steel Find,read and cite all the research you need on (PDF) Weld formation mechanism of fiber laser oscillating PDF On May 1,2015,Kangda Hao and others published Weld formation mechanism of fiber laser oscillating welding of austenitic stainless steel Find,read and cite all the research you need on

(PDF) Study of molten pool dynamics and porosity

PDF On Nov 1,2019,Ruolin Zhang and others published Study of molten pool dynamics and porosity formation mechanism in full penetration fiber laser welding of Al-alloy Find,read and cite all results for this questionWhat causes porosity in laser welds?What causes porosity in laser welds?Porosity can be a particular problem for laser welds in aluminium caused by hydrogen evolution in the weld metal.Hydrogen can come from moisture in the air or surface oxide,or result from inadequate pre-cleaning.Other defects.There are,of course,other defects that can be associated with laser welds.What are the typical defects in laser welds? - TWI results for this questionWhat causes laser welding in aluminum?What causes laser welding in aluminum?Laser welding is shielded using an inert gas shield,and if this shielding is not adequate (due to either too high or too low gas flow rate) then porosity can result.Porosity can be a particular problem for laser welds in aluminium caused by hydrogen evolution in the weld metal.What are the typical defects in laser welds? - TWI

results for this questionFeedbackResearch on weld formation mechanism of laser-MIG arc

In this paper,laser-MIG arc hybrid welding is used to weld low-alloy high-strength steel with a thickness of 3 mm,and a laser-MIG arc hybrid welding process under large gap conditions is developed.This paper studies the effects of arc voltage,laser-wire distance,and wire feed speed on the gap bridging capability of hybrid welding under results for this questionCan laser welds suffer solidification cracking?Can laser welds suffer solidification cracking?The likelihood of laser welds to suffer solidification cracking can limit the welding speed,parent material composition or weld penetration depth that is possible when laser welding both steels and aluminium.Porosity is a less critical defect in laser welds than solidification cracking.What are the typical defects in laser welds? - TWI Keyhole Formation During Spot Laser Welding Heat A study on continuous beam laser welding of dissimilar materials using Multi-Physics simulation R.Indhu,S.Loganathan,L.Vijayaraghavan 2018 A Three-Dimensional Numerical Model for Predicting the Weld Bead Geometry Characteristics in Laser Overlap Welding of Low Carbon Galvanized Steel

Keyhole Formation During Spot Laser Welding Heat

A study on continuous beam laser welding of dissimilar materials using Multi-Physics simulation R.Indhu,S.Loganathan,L.Vijayaraghavan 2018 A Three-Dimensional Numerical Model for Predicting the Weld Bead Geometry Characteristics in Laser Overlap Welding of Low Carbon Galvanized Steel

Main Products