CN1916225A - Phase change jet melting method for improving fatigue property of welded structure - Google Patents
Phase change jet melting method for improving fatigue property of welded structure Download PDFInfo
- Publication number
- CN1916225A CN1916225A CNA2006100155953A CN200610015595A CN1916225A CN 1916225 A CN1916225 A CN 1916225A CN A2006100155953 A CNA2006100155953 A CN A2006100155953A CN 200610015595 A CN200610015595 A CN 200610015595A CN 1916225 A CN1916225 A CN 1916225A
- Authority
- CN
- China
- Prior art keywords
- spray
- fatigue property
- melting method
- welded
- toe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
This invention discloses a phase-transition spray-fusing method for improving the fatigue property of welded structure. The method comprises: coating a spray-coating low phase-transition powder material onto the welding toes of a welding structure by spray-welding or laser spray-fusing method to form a smooth transition metal layer with a thickness of 1-6 mm, wherein the coating layer on the welding toes is thicker than that on the adjacent regions, and the apray-welding material is in the melt state. The low phase-transition powder material is composed of: C 0.04-0.06 wt.%, Mn 0.8-1.2 wt.%, Cr 8.0-10.0 wt.%, Ni 8.0-10.0 wt.%, Mo 0.3-0.6 wt.%, Nb 0.3-0.6 wt.%, Ti 0.3-0.6 wt.%, Si 0.5-0.8 wt.% and Fe, and has a solid phase-transition temperature of 150-250 deg.C. Experimental results show that the spray-fusing method can largely improve the fatigue property of welded structure.
Description
Technical field
The present invention relates to a kind of method of improving welded fatigue property, relate in particular to a kind of phase change jet melting method that improves welded fatigue property.
Background technology
Welding joint and structure are widely used in key areas such as boats and ships, pressurized vessel, vehicle, bridge, oceanographic engineering, engineering machinery, aerospace, electric power, metallurgy, and welded construction especially easily produces premature failure and security incident at the toe of weld position.The physical mechanism that causes the inefficacy of welded construction equipment is a lot, and as fatigue, creep, burn into brittle rupture, wearing and tearing etc., wherein the fatigue damage problem is comparatively common.As because speed-raising, the welding joint fatigue problem is become influence the important hurt mechanism in railway operation safety and rail work-ing life; Cold roll contact fatigue damage problem is not properly settled so far yet in the steel rolling equipment for another example, seriously influences their work-ing life.
Methods such as present stage is main both at home and abroad adopts that TIG moltenly repaiies, hammering and shot-peening improve the fatigue property of welding joint and structure, but these method labour intensity are big, energy consumption is high and can have a negative impact.Ultrasonic impact is light and handy with its topworks, and controllability is good, flexible and convenient to use, noise is minimum, efficient is high, limited few when using, advantage such as cost is low and energy-conservation is applicable to various terminal, is the method that a kind of ideal postwelding improves fatigue properties of welded joints.Yet its effect was not fairly obvious when ultrasonic impact bore low cycle fatigue loading in processing.Therefore, propose a kind of method that not only had been fit to improve welded construction high cycle fatigue performance but also can improve the welded construction low cycle fatigue property well and have good realistic meaning.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, a kind of phase change jet melting method that improves welded fatigue property is provided, this method not only is fit to improve welded construction high cycle fatigue performance but also can improves the welded construction low cycle fatigue property well, and can further eliminate welding residual-tensile stress, introducing stress under compression.
A kind of phase change jet melting method that improves welded fatigue property of the present invention, adopt surfacing or laser jet melting method will hang down the phase transformation powdered material and be coated in welded toe of weld position to form the metal cladding of the smooth transition of coating thickness between 1mm-6mm at the toe of weld position, the coating thickness at described toe of weld position is thicker than the coating thickness of near zone, described spray material is a molten state, the component of described low phase transformation powdered material and weight percent content are: C:0.04～0.06, Mn:0.8～1.2, Cr:8.0～10.0, Ni:8.0～10.0, Mo:0.3～0.6, Nb:0.3～0.6, Ti:0.3～0.6, Si:0.5～0.8, all the other are Fe; Its solid-state phase changes point temperature range is 150～250 ℃.
Experimental result shows: this method can improve welded fatigue property significantly.Can improve its high cycle fatigue fatigue strength (2 * 106) 60～75% (different joint form increase rates are different) for soft steel, improved 7～15 times fatigue lifetime in all scopes of height (the circulation cycle surpasses 1 * 105); Can improve its low cycle fatigue fatigue strength (2 * 106) 30～55% (different joint form increase rates are different), improved 5～45 times fatigue lifetime in low all scopes.For in strong steel can improve its high cycle fatigue fatigue strength (2 * 106) 65～85% (different joint form increase rates are different), improved 9～19 times fatigue lifetime in all scopes of height (the circulation cycle surpasses 1 * 105); Can improve its low cycle fatigue fatigue strength (2 * 106) 32～50% (different joint form increase rates are different), improved 7～35 times fatigue lifetime in low all scopes.Can improve its high cycle fatigue fatigue strength (2 * 106) 86～125% (different joint form increase rates are different) for high-strength steel, improved 17～56 times fatigue lifetime in all scopes of height (the circulation cycle surpasses 105); Can improve its low cycle fatigue fatigue strength (2 * 106) 25～45% (different joint form increase rates are different), improved 12～100 times fatigue lifetime in low all scopes.
By finite element analysis computation as can be known: this mode by spray fusing, the new technology of welding joint toe of weld zone being filled shaping can make its stress concentration degree significantly reduce, and is especially more obvious for the serious original welding joint form effect of stress concentration.For opposite joint, its stress concentration factor can reduce to 1.05～1.1 by 1.5～2.3; For the cross joint joint, its stress concentration factor can reduce to 1.1～1.15 by 1.8～3.0; For vertical corner joint, its stress concentration factor can reduce to 1.15～1.25 by 2.0～3.5; For tube stub, its stress concentration factor can reduce to 1.3～1.8 by 3.5～10.
Low phase transformation powder filler can significantly reduce welding stretching unrelieved stress, and introduces compressive residual stress, thereby further improves the joint fatigue property.After measured, for different steel grades, this method can introduce-210～-stress under compression of 540MPa.
Description of drawings
Fig. 1 is that weldment is original as-welded;
Fig. 2 is for adopting a kind of weldment spray fusing state that improves the jet melting method of welded fatigue property.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done to describe in detail.
As shown in drawings, a kind of phase change jet melting method that improves welded fatigue property, adopt surfacing or laser jet melting method will hang down the phase transformation powdered material and be coated in welded toe of weld position to form the metal cladding of the smooth transition of coating thickness between 1mm-6mm at the toe of weld position, the coating thickness at described toe of weld position is thicker than the coating thickness of near zone, described spray material is a molten state, the component of described low phase transformation powdered material and weight percent content (%) are: C:0.04～0.06, Mn:0.8～1.2, Cr:8.0～10.0, Ni:8.0～10.0, Mo:0.3～0.6, Nb:0.3～0.6, Ti:0.3～0.6, Si:0.5～0.8, all the other are Fe; Its solid-state phase changes point temperature range is 150～250 ℃.The coating thickness of the spray material at described toe of weld position is preferably 2mm-6mm, and thickness is lower than the stress that 1mm is difficult to eliminate the toe of weld position, and thickness is higher than 6mm makes cost too high.
The main technical principle that this method improves fatigue performance of welded structure is will hang down the toe of weld position of phase transformation powder spraying to welding joint by suitable thermal source, perhaps in coating process, simultaneously material melts is sprayed in institute, perhaps again material melts is sprayed in institute after the coating, form the tectum that adequate thickness has higher curvature radius and smooth surface transition on the toe of weld position of welding joint metallurgical binding ground, can reduce the stress concentration degree in welding joint toe of weld zone greatly like this; The starting point of this tectum phase transformation and end point all appear at lower temperature, and this moment, material was in elastoplasticity or elastic stage, and the phase transformation volumetric expansion will reduce the residual-tensile stress that the welding thermal field causes, and introduce compressive residual stress.Therefore improved the fatigue property of welded construction and joint.
For the jet melting method that improves fatigue performance of welded structure, the technical essential of its implementation process is to cover the low phase change jet melting material that one deck profile has higher curvature radial features and smooth surface transition (shown among Fig. 2 1) on welding joint toe of weld position metallurgical binding ground.This point can be utilized the suitable swinging technique means of tools section with spray fusing equipment, and the coating thickness that is thicker than near zone by the coating thickness of controlling spray fusing thickness, toe of weld position is realized.Can adopt spray fusing equipment commonly used.
Claims (3)
1. phase change jet melting method that improves welded fatigue property, it is characterized in that: adopt surfacing or laser jet melting method will hang down the phase transformation powdered material and be coated in welded toe of weld position to form the metal cladding of the smooth transition of coating thickness between 1mm-6mm at the toe of weld position, the coating thickness at described toe of weld position is thicker than the coating thickness of near zone, described spray material is a molten state, the component of described low phase transformation powdered material and weight percent content are: C:0.04～0.06, Mn:0.8～1.2, Cr:8.0～10.0, Ni:8.0～10.0, Mo:0.3～0.6, Nb:0.3～0.6, Ti:0.3～0.6, Si:0.5～0.8, all the other are Fe; Its solid-state phase changes point temperature range is 150～250 ℃.
2. the phase change jet melting method of the welded fatigue property of improvement according to claim 1 is characterized in that: the coating thickness of the spray material at described toe of weld position is 2mm-6mm.
3. the phase change jet melting method of the welded fatigue property of improvement according to claim 1 is characterized in that: described surfacing is plasma spraying, flame spray remolten, arc spray melting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100155953A CN1916225A (en) | 2006-09-06 | 2006-09-06 | Phase change jet melting method for improving fatigue property of welded structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100155953A CN1916225A (en) | 2006-09-06 | 2006-09-06 | Phase change jet melting method for improving fatigue property of welded structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1916225A true CN1916225A (en) | 2007-02-21 |
Family
ID=37737289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006100155953A Pending CN1916225A (en) | 2006-09-06 | 2006-09-06 | Phase change jet melting method for improving fatigue property of welded structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1916225A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103917327A (en) * | 2011-11-09 | 2014-07-09 | 国立大学法人大阪大学 | Welding method and weld joint |
| CN108913975A (en) * | 2018-05-25 | 2018-11-30 | 金华华科激光科技有限公司 | A kind of method of the wear-resistant laser cladding powder and laser melting coating of 610HV or more |
| CN110819931A (en) * | 2019-11-29 | 2020-02-21 | 山东交通学院 | Powder-cored welding wire, preparation method and application thereof, porous coating and preparation method thereof |
| CN113714606A (en) * | 2020-05-26 | 2021-11-30 | 西安核设备有限公司 | TIG fusion repair process method for defects of laser welding joint |
-
2006
- 2006-09-06 CN CNA2006100155953A patent/CN1916225A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103917327A (en) * | 2011-11-09 | 2014-07-09 | 国立大学法人大阪大学 | Welding method and weld joint |
| CN108913975A (en) * | 2018-05-25 | 2018-11-30 | 金华华科激光科技有限公司 | A kind of method of the wear-resistant laser cladding powder and laser melting coating of 610HV or more |
| CN110819931A (en) * | 2019-11-29 | 2020-02-21 | 山东交通学院 | Powder-cored welding wire, preparation method and application thereof, porous coating and preparation method thereof |
| CN110819931B (en) * | 2019-11-29 | 2021-10-12 | 山东交通学院 | Powder-cored welding wire, preparation method and application thereof, porous coating and preparation method thereof |
| CN113714606A (en) * | 2020-05-26 | 2021-11-30 | 西安核设备有限公司 | TIG fusion repair process method for defects of laser welding joint |
| CN113714606B (en) * | 2020-05-26 | 2023-01-31 | 西安核设备有限公司 | TIG fusion repair process method for defects of laser welding joint |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105499751A (en) | Hardfacing repair process used for hot continuous rolling pinch roll | |
| CN104148806B (en) | A kind of cast steel with high chromium roll top layer fatigue statistic rapid laser repair method | |
| JP6211170B2 (en) | Zinc-resistant induction cracked steel sheet and manufacturing method thereof | |
| CA2971490C (en) | Steel plate having excellent resistance to fatigue crack growth and its manufacturing method | |
| CN101270459B (en) | Method for improving welded joint fatigue strength following chilling treatment after weld toe TIG refusion | |
| CN100595016C (en) | Welding method of bainitic steel fork and carbon steel rail | |
| CN111283308B (en) | All-position shielded metal arc welding process for ultralow-temperature 304LN austenitic stainless steel medium plate | |
| EP3369516B1 (en) | Multistage joining process with thermal sprayed layers | |
| CN1916225A (en) | Phase change jet melting method for improving fatigue property of welded structure | |
| JP5880260B2 (en) | Manufacturing method of welded structure | |
| CN113275710B (en) | Non-preheating welding method for 750MPa grade high-strength steel medium plate for hydraulic support | |
| CN1916224A (en) | Jet melting method for improving fatigue property of welded structure | |
| JP2002172469A (en) | Spot welding method for high strength steel plate | |
| CN1116955C (en) | Medium flash welding method for high manganese steel frog and carbon steel rail | |
| JP2004122152A (en) | Method for enhancing fatigue strength of spot welded joint by ultrasonic shock treatment | |
| CN101870040A (en) | Cylinder fatigue internal-crack welding and restoring process of piston type oxygen compressor | |
| CN101270452A (en) | Connection material for flashing light jointing of hadfield steel cross frog and carbon steel rails, and production method thereof | |
| CN101733514A (en) | Rail on-line repairing technology of self-shielded flux-cored welding wire at low preheating temperature | |
| JP3875878B2 (en) | Spot-welding method for high-strength steel sheets with excellent fatigue strength characteristics of welds | |
| JP2004122144A (en) | Method for enhancing tensile strength of spot welded joint by ultrasonic shock treatment | |
| CN117403049A (en) | Method for eliminating abnormal structure of medium-carbon low-alloy corrosion-resistant steel rail pneumatic welding joint | |
| JP4516702B2 (en) | High toughness low temperature transformation flux cored wire | |
| WO2006105658A1 (en) | Laser welding of galvanized steel | |
| CN109465523A (en) | A kind of welding method of weathering steel | |
| CN114571131B (en) | Self-protection flux-cored wire for extrusion roller priming layer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |