CN103286480A - Shielding gas for high-power TIG welding - Google Patents
Shielding gas for high-power TIG welding Download PDFInfo
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- CN103286480A CN103286480A CN2013102221771A CN201310222177A CN103286480A CN 103286480 A CN103286480 A CN 103286480A CN 2013102221771 A CN2013102221771 A CN 2013102221771A CN 201310222177 A CN201310222177 A CN 201310222177A CN 103286480 A CN103286480 A CN 103286480A
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Abstract
The invention discloses a shielding gas for high-power TIG welding. The shielding gas for high-power TIG welding is composed of, by volume, 1% to 5% of hydrogen, 2% to 10% of helium, and the balance argon. The shielding gas is applicable to metal welding, particularly austenitic stainless steel welding, by a high-power TIG. According to the shielding gas for high-power TIG welding, oxidation conditions of the surface of a welded joint and oxidation conditions of areas nearby the welded joint can be improved, the depth-to-width ratio of TIG welding can be improved, and burning losses of tungsten electrodes can be reduced.
Description
Technical field
The present invention relates to a kind ofly for the high-power TIG solder technology, more particularly, particularly weld the protection gas of austenitic stainless steel.
Background technology
As everyone knows, non-consumable gas shielded arc welding (TIG weldering) is a kind of welding method that extensively adopts during modern industry is produced, and is the representative of high-quality welding method.But still there is tangible limitation in this method, and welding penetration is shallow, and the ratio (depth-to-width ratio) of pool depth and width is about 0.2 only, and deposition efficiency is low, and welding efficiency is low, generally only limits to weld the following plate of 3mm, need open bevel during slab and carry out multi-pass welding.If adopt multi-pass welding, then welding deformation and heat affected area increase, and can have influence on the quality of welding point usually.
For adapting to present Welding Structure towards the trend of maximization, high parameter, accurate dimension development, develop solder technology efficient, the energy-saving and environmental protection type at large scale structure, the high-power TIG welding method is just obtaining paying attention to, and is obtaining trial aspect carbon steel, stainless steel, the titanium or titanium alloy thick plates and is using.The high-power TIG welding method can realize bigger fusion penetration or bigger deposited amount, in particular for disposable welding than slab or carry out the backing welding of multi-pass welding multilayer welding.
Have following deficiency under the high-power TIG welding condition: (1) is high-power, and heat production is more down, weldering plate heating surface area is bigger, the weldering plate is protected improper easy generation oxidative phenomena, not only greatly worsens mechanical property and the corrosion resistance of weld seam, and influences the exterior appearance of weld seam; (2) scaling loss of big electric current aggravation tungsten electrode; (3) there are general TIG welded seam fusion penetration and molten wide ratio problem of smaller.The mist that the TIG welding is used pure argon or argon gas and helium usually is as protective gas, and protection gas forms layer of inert around electric arc, the molten bath is played the protective effect of secluding air.Under above-mentioned high-power TIG welding situation, need to adopt more suitable protective gas.
Summary of the invention
Task of the present invention is to provide a kind of protection gas; be used for the high-power TIG weld metal, particularly weld austenitic stainless steel, utilize this protective gas to improve the oxidation situation of face of weld and weld seam near zone; improve the depth-to-width ratio of TIG welding, and reduce the scaling loss of tungsten electrode.
In order to solve this task; formed by 1～5% hydrogen, 2～10% helium (percent by volume) and the argon gas of residual volume according to protection gas of the present invention, be preferably 2～5% hydrogen, 5～10% helium (percent by volume) and the argon gas of residual volume and form.
It is 1～5%(percent by volume that the present invention protects the hydrogen content of gas).The hydrogen content of protection gas can improve heat conductivity, simultaneously reduction is played on the materials to be welded surface.In argon gas, add the scaling loss that hydrogen can also reduce tungsten electrode, improve the service life of tungsten electrode.
It is 2～10%(percent by volume that the present invention protects the helium content of gas).Add the deflection that helium can improve heat conductivity and electric arc in argon gas, lower helium content can also guarantee the observability that electric arc is good simultaneously.
The invention has the beneficial effects as follows:
In practice; (model thickness is greater than 3mm to use the present invention to protect gas to carry out the high-power TIG welding; electric current is greater than 200A) time, good result obtained aspect the scaling loss of the depth-to-width ratio that improves the TIG welding, the oxidation situation of improving face of weld and weld seam near zone and reduction tungsten electrode.
The specific embodiment
In the present invention; will be by the hydrogen of percent by volume 1～5%; the mixture that 2～10% helium and the argon gas of residual volume are formed is as protection gas; be used for the high-power TIG welding; flow is chosen according to welding current and thickness of slab, basically as long as protection gas can cover the surface of molten bath and the easy zoneofoxidation of molten bath high ambient temperatures.
Embodiment 1
This welding procedure is directed to the stainless butt welding workpiece of AISI304 of 4mm thickness, square groove especially.
Source of welding current straight polarity direct current (is that workpiece connects positive source; the welding torch electrode connects power cathode); electric current 330～360A; voltage 14～15V; speed of welding 400～700mm/min; protective gas consists of 2～3%(percent by volume) hydrogen, 8～10%(percent by volume) helium and the argon gas of residual volume, shield gas flow rate is 11～16L/min.
The weld pool width that obtains at last is 6.0mm, and weld seam meets ASTMA262 and AS3992-1998 standard after tested.With this understanding, weld seam protection is good, and tungsten electrode does not have scaling loss substantially.
Embodiment 2
When being directed to 20mm thickness A ISI304 stainless steel butt joint multi-pass welding especially, this welding procedure carries out the high-power TIG backing welding.
During with TIG welding method backing welding; source of welding current straight polarity direct current (is that workpiece connects positive source; the welding torch electrode connects power cathode); electric current 220～300A; voltage 15～16V; protective gas consists of 4～5% hydrogen, 5～6% helium (percent by volume) and the argon gas of residual volume, and shield gas flow rate is 11～16L/min.
The minimum effective thickness of last backing run is 4.7mm, and heat affected area (HAZ) width is about 3mm.With this understanding, weld seam protection is good, and tungsten electrode does not have scaling loss substantially.
Embodiment 3
This welding procedure is directed to the AISI304 corrosion resistant plate butt weld with high-power TIG welding method welding 12mm thickness, single welding one-shot forming, square groove especially.
Source of welding current straight polarity direct current (is that workpiece connects positive source; the welding torch electrode connects power cathode), electric current 600～720A, voltage 14～16V; speed of welding 225～375mm/min, protective gas consist of 2～3% hydrogen, 8～10% helium (percent by volume) and the argon gas of residual volume.
The weld pool width that obtains at last is about 12mm, and weld seam meets ASTMA262 and AS3992-1998 standard after tested.With this understanding, weld seam protection is good, and tungsten electrode does not have scaling loss substantially.
More than the present invention has been done exemplary description; should be noted that; under the situation that does not break away from core of the present invention, the replacement that is equal to that any simple distortion, modification or other those skilled in the art can not spend creative work all falls into protection scope of the present invention.
Claims (4)
1. a protection gas that is used for the high-power TIG welding is characterized in that, is made up of 1～5% hydrogen, 2～10% helium and the argon gas of residual volume according to percent by volume.
2. a kind of protection gas for high-power TIG welding according to claim 1 is characterized in that, preferably is made up of 2～5% hydrogen, 5～10% helium and the argon gas of residual volume.
3. the application in the high-power TIG welding as claim 1 or 2 described protection gas is characterized in that described high-power TIG is welded as model thickness greater than 3mm, and electric current is greater than 200A, and welded specimen is austenitic stainless steel.
4. application according to claim 3 is characterized in that, described austenitic stainless steel is the AISI304 stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102221771A CN103286480A (en) | 2013-06-05 | 2013-06-05 | Shielding gas for high-power TIG welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102221771A CN103286480A (en) | 2013-06-05 | 2013-06-05 | Shielding gas for high-power TIG welding |
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| CN103286480A true CN103286480A (en) | 2013-09-11 |
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| CN2013102221771A Pending CN103286480A (en) | 2013-06-05 | 2013-06-05 | Shielding gas for high-power TIG welding |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106363761A (en) * | 2016-08-31 | 2017-02-01 | 洪雅竹元科技有限公司 | Bamboo-linen composite board and manufacturing method thereof |
| CN107096981A (en) * | 2017-04-28 | 2017-08-29 | 中车四方车辆有限公司 | A kind of welding method of two-phase stainless steel sheet |
| CN107553010A (en) * | 2017-08-09 | 2018-01-09 | 安徽红桥金属制造有限公司 | A kind of ternary hybrid protection gas used for gas shield welding |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6237836B1 (en) * | 1997-11-03 | 2001-05-29 | Messer Griesheim Gmbh | Protective gas for tig welding |
| EP1295669A1 (en) * | 2001-09-21 | 2003-03-26 | L'air Liquide, S.A. à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procédés Georges Claude | Tig-welding method wtih filter wire and gas shielding |
| CN1853846A (en) * | 2005-03-31 | 2006-11-01 | 梅塞尔集团有限公司 | Shielding gas for WIG-welding of metals |
| CN1876314A (en) * | 2005-06-06 | 2006-12-13 | 液体空气乔治洛德方法利用和研究的具有监督和管理委员会的有限公司 | TIG braze welding method involving a mixture of argon, helium and hydrogen |
-
2013
- 2013-06-05 CN CN2013102221771A patent/CN103286480A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6237836B1 (en) * | 1997-11-03 | 2001-05-29 | Messer Griesheim Gmbh | Protective gas for tig welding |
| EP1295669A1 (en) * | 2001-09-21 | 2003-03-26 | L'air Liquide, S.A. à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procédés Georges Claude | Tig-welding method wtih filter wire and gas shielding |
| CN1853846A (en) * | 2005-03-31 | 2006-11-01 | 梅塞尔集团有限公司 | Shielding gas for WIG-welding of metals |
| CN1876314A (en) * | 2005-06-06 | 2006-12-13 | 液体空气乔治洛德方法利用和研究的具有监督和管理委员会的有限公司 | TIG braze welding method involving a mixture of argon, helium and hydrogen |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106363761A (en) * | 2016-08-31 | 2017-02-01 | 洪雅竹元科技有限公司 | Bamboo-linen composite board and manufacturing method thereof |
| CN107096981A (en) * | 2017-04-28 | 2017-08-29 | 中车四方车辆有限公司 | A kind of welding method of two-phase stainless steel sheet |
| CN107553010A (en) * | 2017-08-09 | 2018-01-09 | 安徽红桥金属制造有限公司 | A kind of ternary hybrid protection gas used for gas shield welding |
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Application publication date: 20130911 |