CN101254567A - Laser auxiliary activity welding method - Google Patents
Laser auxiliary activity welding method Download PDFInfo
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- CN101254567A CN101254567A CN 200710017744 CN200710017744A CN101254567A CN 101254567 A CN101254567 A CN 101254567A CN 200710017744 CN200710017744 CN 200710017744 CN 200710017744 A CN200710017744 A CN 200710017744A CN 101254567 A CN101254567 A CN 101254567A
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Abstract
A laser-assisted active welding method, which aims to increase welding fusion depth in the absence of active agent, comprises the following steps: fusing the surface of welding beads to be welded by a laser beam under protection of oxygen; and welding the welding beads pre-processed by laser by common welding method. The selected laser beam is a small-power laser beam with a power range of 5 to 100 W. The welding bead fused by the laser has a fusion width less than or equal to 1 mm and a fusion width less than or equal to 2 mm.
Description
Technical field
The present invention relates to welding method, specifically is a kind of method of welding with laser beam processing.
Background technology
Active welding is used early in the TIG weldering, has formed the notion of A-TIG weldering.A-TIG (Activating flux TIG) welding is to be coated with the very thin activating agent of last layer on the surface of welding sheet material, causes that welding arc shrinks or the molten bath fluidised form changes, and can make fusion penetration increase by 1～2 times than conventional TIG weldering.Discovering of Shanping Lu uses mist that the fusion penetration of TIG weldering is increased.Above method has the following disadvantages: use the face of weld that obtains behind activating agent or the mist to have slag, the surface forming variation.The existence of slag often makes follow-up welding procedure become complicated, influences the serviceability of weld seam, even influences the decay resistance of weld seam.
Summary of the invention
The purpose of this invention is to provide a kind of welding method, under the situation of not using activating agent, increase the fusion penetration of welding.
The present invention is a kind of active welding method, at first adopts laser beam fusing welding bead to be welded surface under the oxygen protection, adopts conventional welding method then, covers the welding bead of laser pre-treated.
Usefulness of the present invention is: oxygen element content increases in the weld seam; make the surface tension temperature coefficient by the negative main cause of welding penetration increase just that becomes; the present invention at first uses laser beam fusing welding bead to be welded surface under the oxygen protection; the oxygen content of face of weld is increased; and then make welding penetration increase by 2～3 times, remedied simple use activating agent or the deficiency of oxygen mixed gas has been arranged.
Description of drawings
Fig. 1 is a schematic diagram of the present invention, Fig. 2 is the macro morphology figure in the weld seam front after the low-power laser bundle fusing, Fig. 3 is that laser beam melts the weld seam shape appearance figure that carries out the TIG welding behind the welding bead to be welded surface, Fig. 4 does not adopt laser beam to melt the weld seam shape appearance figure that the TIG weldering is carried out on welding bead to be welded surface in advance, Fig. 5 adopts laser beam to melt the weld seam shape appearance figure that the TIG postwelding is carried out on welding bead to be welded surface, Fig. 6 does not adopt laser beam to melt the weld seam shape appearance figure that Laser Welding is carried out on welding bead to be welded surface in advance, and Fig. 7 adopts laser beam to melt the weld seam shape appearance figure that carries out Laser Welding behind the welding bead to be welded surface.
The specific embodiment
As shown in Figure 1, the present invention is a kind of active welding method, at first adopts laser beam fusing welding bead to be welded surface under the oxygen protection, uses conventional welding method then, covers the welding bead of laser pre-treated.The laser beam that adopts is the low-power laser bundle, and its power bracket is 5～100W.Laser beam melts the fusion penetration of welding bead to be welded less than 1mm, or equals 1mm, and is molten wide less than 2mm, or equals 2mm.Technological parameter is as shown in table 1:
The technological parameter of table 1 low-power laser fusing
| Defocusing amount fd | Power P | Speed V | Oxygen flow Q | Nozzle diameter |
| 0mm | 50W | 6mm/s | 20L/min | 6mm |
Adopt laser beam fusing welding bead to be welded surface under the oxygen protection, adopt conventional welding method then, conventional welding method is the TIG welding method, or the Laser Welding welding method.
Embodiment 1
The material that adopts is SUS 304 stainless steels, before weldering welding bead is carefully cleared up with sand paper, at first adopts the CO of 50W
2Laser beam is fusing weldment surface under the oxygen protection, and the oxygen content of face of weld is increased.In order relatively to use low-power laser and not use the fusion penetration of low-power laser treatment process to change, only melt half of sample, as shown in Figure 1.The technological parameter of low-power laser fusing is as shown in table 1.Use conventional TIG welding then, cover the low-power laser pretreating zone, low-power laser pretreating zone and non-laser treated region are once welded finish, welding parameter such as table 2 show.The argonaut welding device is adopted in test, and the argon arc welding welding gun is fixed, and workpiece places on the workbench that can move horizontally, and can guarantee that like this arc length does not change in welding process, thereby has guaranteed the stability of welding procedure.The weld seam of transverse cuts laser pre-treated district and non-laser treated region is made and is observed fusion penetration, molten wide variation behind the sample.
Figure 2 shows that the macro morphology in the weld seam front after low-power laser melts, because laser power is little, the weld seam of formation is very narrow, molten wide only 1mm, and face of weld is oxidized.Figure 3 shows that the result of TIG welding.As seen from the figure, welding bead obviously narrows down in the laser pre-treated district, and shaping surface is good, and the point-like oxide of a small amount of black is arranged, and weld metal is obviously piled up at the intersection of low-power laser pretreating zone and non-laser treated region.
Under identical TIG welding conditions, the fusion penetration of non-laser treated region has only 2～3mm, and the fusion penetration in laser pre-treated district is 10mm.As Fig. 4, shown in Figure 5, the molten wide of laser pre-treated district obviously reduces than the molten wide of non-laser treated region, and the weld shape of laser treated region is a finger-like.Analyze the oxygen content in the weld seam, the weld seam oxygen content of handling through low-power laser is not 32ppm, and the weld seam oxygen content of handling through low-power laser is 128ppm, in the permission scope of application of material.
After using low-power laser to handle, the chemical composition of weld seam, joint mechanical property satisfy the relevant criterion requirement shown in table 3, table 4.
Embodiment 2
The material that test is adopted is SUS 304 stainless steels, and specimen size is 200mm * 80mm * 8mm, before the weldering welding bead is carefully cleared up with sand paper.The method that low-power laser is handled is identical with embodiment's 1, adopts conventional CO
2Laser Welding covers low-power laser pretreating zone, conventional CO
2The parameter of laser weld is as shown in table 5.
Under identical laser weld standard, the fusion penetration of laser treated region has increased 1mm than the fusion penetration of non-laser treated region.As Fig. 6, shown in Figure 7, the molten wide of the weld seam top of laser treated region obviously reduces than the molten wide of non-laser treated region.Analyze the oxygen content in the weld seam, the weld seam oxygen content of handling through low-power laser is not 36ppm, and the weld seam oxygen content of handling through low-power laser is 98ppm, in the permission scope of application of material.
Table 2TIG welding parameter
Table 3 chemical analysis contrast (W) %
The mechanical property of table 4 welding point
The technological parameter of table 5 laser weld
| Defocusing amount fd | Power P | Speed V | Argon flow amount Q |
| 0mm | 3.2KW | 10mm/s | 20L/min |
Claims (5)
1. laser auxiliary activity welding method is characterized in that: at first adopt laser beam fusing welding bead to be welded surface under the oxygen protection, adopt conventional welding method then, cover the welding bead of laser pre-treated.
2. laser auxiliary activity welding method according to claim 1 is characterized in that the laser beam that adopts is the low-power laser bundle, and its power bracket is 5～100W.
3. laser auxiliary activity welding method according to claim 1 is characterized in that fusion penetration that laser beam melts welding bead to be welded less than 1mm, or equals 1mm, and is molten wide less than 2mm, or equals 2mm.
4. laser auxiliary activity welding method according to claim 1 is characterized in that conventional welding method is the TIG welding method.
5. laser auxiliary activity welding method according to claim 1 is characterized in that conventional welding method is the Laser Welding welding method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710017744 CN101254567A (en) | 2007-04-17 | 2007-04-17 | Laser auxiliary activity welding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710017744 CN101254567A (en) | 2007-04-17 | 2007-04-17 | Laser auxiliary activity welding method |
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| CN101254567A true CN101254567A (en) | 2008-09-03 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179645A (en) * | 2010-10-27 | 2011-09-14 | 天津大学 | Active agent for laser welding and method for laser welding by utilizing same |
| CN104625411A (en) * | 2014-12-15 | 2015-05-20 | 哈尔滨工业大学 | Welding method for Ti2AlNb-based intermetallic compound and dissimilar titanium alloy |
| CN105855767A (en) * | 2016-05-12 | 2016-08-17 | 安徽天海厨房设备有限公司 | Welding method of cooking utensil |
| CN111230297A (en) * | 2020-01-21 | 2020-06-05 | 厦门理工学院 | Laser welding small hole depth increasing method |
-
2007
- 2007-04-17 CN CN 200710017744 patent/CN101254567A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179645A (en) * | 2010-10-27 | 2011-09-14 | 天津大学 | Active agent for laser welding and method for laser welding by utilizing same |
| CN104625411A (en) * | 2014-12-15 | 2015-05-20 | 哈尔滨工业大学 | Welding method for Ti2AlNb-based intermetallic compound and dissimilar titanium alloy |
| CN104625411B (en) * | 2014-12-15 | 2016-07-06 | 哈尔滨工业大学 | A kind of Ti2The method of AlNb base intermetallic compound and xenogenesis titanium alloy welding |
| CN105855767A (en) * | 2016-05-12 | 2016-08-17 | 安徽天海厨房设备有限公司 | Welding method of cooking utensil |
| CN111230297A (en) * | 2020-01-21 | 2020-06-05 | 厦门理工学院 | Laser welding small hole depth increasing method |
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