CN112059372A - Welding process for base pipe and pipe plate of thin-wall air cooler - Google Patents
Welding process for base pipe and pipe plate of thin-wall air cooler Download PDFInfo
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- CN112059372A CN112059372A CN202010946275.XA CN202010946275A CN112059372A CN 112059372 A CN112059372 A CN 112059372A CN 202010946275 A CN202010946275 A CN 202010946275A CN 112059372 A CN112059372 A CN 112059372A
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- welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to a welding process of a base pipe and a pipe plate of a thin-wall air cooler, which adopts a pulse TIG welding method, wherein MESSER POLYSUODE welding machine is used as welding equipment, AUTOTIG250POLYSOUDE power supply is configured with a TS60 machine head, and an MCP150 programmer is used for programming; the welding parameters were set as follows: pre-gas feeding time is 3s, preheating current is 70A, peak current is 150A, peak time is 120ms, base current is 67A, base time is 200s, welding speed is 100.5mm/min, current decay time is 3s, and gas flow is 8-10L/min; the tungsten electrode is a cerium tungsten electrode with the diameter of 2.5mm, the base tube and the tube plate are in expansion joint in a mechanical positioning mode during welding, a tool is adopted, the tube end is tightly attached to the tube hole, and the length of the tube end extending out of the tube plate is 1.5-2 mm. The welding test plate and the welding joint have smooth surfaces and uniform welding seams.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of air cooler production, in particular to a welding process of a base tube and a tube plate of a thin-wall air cooler.
[ background of the invention ]
In the thin-wall air cooler, the welding connection between the base pipe and the pipe plate is always a difficult problem to be solved by production enterprises. The leakage of the welded joint of the base pipe and the pipe plate in the operation process is the main reason that the thin-wall air cooler cannot work normally.
The welded joint of the base pipe and the pipe plate requires even weld formation, good root fusion, and the thickness of the weld meets the design requirement, and the internal shrinkage of the welded pipe hole is generally not more than 10% of the internal diameter of the pipe hole. For a welded joint of a base pipe and a pipe plate of the thin-wall air cooler, the size of a formed molten pool is allowed to be small, otherwise, the shrinkage in a pipe hole exceeds the standard, and further pipe expanding procedures and the heat exchange efficiency during working are influenced. Therefore, the heat input and the shape of the weld pool must be strictly controlled during welding, so that a complete weld pool is formed at the welding joint and the pipe orifice is not excessively retracted.
The pipe end of the base pipe and the pipe plate welded joint with the pipe wall thickness of less than 1mm is easy to turn inwards in the welding process, so that the base pipe and the pipe plate cannot be welded together. The main reason is that the base pipe and the pipe plate are always assembled to form a certain gap, the pipe plate is thick and the base pipe is thin, and the edge of a hole of the pipe plate is not melted and the base pipe is melted during welding, so that the base pipe is turned inwards, and a welding pool cannot be formed. Because the heat conductivity of austenitic stainless steel is only about 1/2 of carbon steel, the phenomenon that the pipe end is turned inwards is more easily generated.
[ summary of the invention ]
In order to solve the problems, the invention aims to provide a welding process of a base pipe and a pipe plate of a thin-wall air cooler, wherein the welding seam is formed uniformly, the root fusion is good, and the thickness of the welding seam meets the design requirement.
In order to achieve the purpose, the invention adopts the technical scheme that: the welding process of the base pipe and the pipe plate of the thin-wall air cooler adopts a pulse TIG welding method, the welding equipment adopts a MESSER POLYSUODE welding machine, an AUTOTIG250POLYSOUDE power supply is configured with a TS60 handpiece, and an MCP150 programmer is used for programming; the welding parameters were set as follows: pre-gas feeding time is 3s, preheating current is 70A, peak current is 150A, peak time is 120ms, base current is 67A, base time is 200s, welding speed is 100.5mm/min, current decay time is 3s, and gas flow is 8-10L/min; the tungsten electrode is a cerium tungsten electrode with the diameter of 2.5mm, the base tube and the tube plate are in expansion joint in a mechanical positioning mode during welding, a tool is adopted, the tube end is tightly attached to the tube hole, and the length of the tube end extending out of the tube plate is 1.5-2 mm.
The welding process of the base tube and the tube plate of the thin-wall air cooler is further set as follows: the tool is made of stainless steel with the hardness equivalent to that of the base pipe and is processed into a conical flaring structure, the small head is inserted into the gate of the base pipe, the large head side of the tool is properly hammered, the pipe opening of the base pipe is enlarged, and the pipe opening wall is tightly attached to the pipe plate.
The welding process of the base tube and the tube plate of the thin-wall air cooler is further set as follows: according to the welding parameters, the distance between the tungsten electrode and the tube plate is 1.5-2 mm, the distance between the tungsten electrode and the tube wall is 1.5-2 mm, the tungsten electrode is parallel to the tube axis, the arc starting position is 9 points, and the overlapping length of the welding seam is not less than 5 mm.
The welding process of the base tube and the tube plate of the thin-wall air cooler is further set as follows: the taper angle of the tip of the tungsten electrode is 20-30 degrees, and the radius of the top end of the tungsten electrode is 0.3-0.5 mm.
Compared with the prior art, the invention has the following beneficial effects: according to the welding process of the base tube and the tube plate of the thin-wall air cooler, the surfaces of a welding test plate and a welding joint are smooth, and the welding seam is uniform. And the split welding seam inspection shows that the root fusion of the welding seam is good, and the size of the welding seam meets the requirement. The process is used for welding products, achieves satisfactory results, and is qualified once through tightness inspection and surface 100% penetration inspection. The operation condition of the installed product is always good, and the phenomenon of pipe end weld joint leakage does not occur.
[ detailed description ] embodiments
The welding process of the thin-wall air cooler base pipe and the pipe plate is further described in detail through specific embodiments.
The welding process of the base pipe and the pipe plate of the thin-wall air cooler comprises the following steps:
the pulse TIG welding method is adopted, the pulse heating is carried out in the welding process, the high-temperature retention time of the metal in the molten pool is short, the metal cooling is fast, the electric arc stiffness is good, the energy is concentrated, the pulse TIG welding method is suitable for all-position welding heads, the welding energy can be adjusted, the shape of the molten pool can be controlled, the forming of a circle of a welding line is uniform, the welding process is stable, and the pulse TIG welding method is the most ideal process method for welding the thin-.
The welding equipment uses MESSER POLYSUODE welding machine, AUTOTIG250POLYSOUDE power supply configuration TS60 handpiece, MCP150 programmer to program; the equipment can program the parameters necessary for all-position base pipe-pipe plate automatic welding, such as advanced air supply, delayed air stop, preheating, pulse parameters and the like, and meet the requirements of the welding process on program parameters and the accurate execution of the parameters. The welding parameters were set as follows: the method comprises the steps of pre-feeding gas time 3s, preheating current 70A, peak current 150A, peak time 120ms, base current 67A, base time 200s, welding speed 100.5mm/min, current decay time 3s and gas flow 8-10L/min. Whether the welding parameters are proper or not directly influences the welding quality, and the adjustment of the welding parameters is an important basis for formulating the welding process. For welding of a base pipe and a pipe plate, welding parameters have influence on the inherent quality and appearance forming of the joint.
The tungsten electrode is a cerium tungsten electrode with the diameter of 2.5mm, the tip cone angle of the tungsten electrode is 20-30 degrees, and the radius of the top end of the tungsten electrode is 0.3-0.5 mm. The distance between the tungsten electrode and the tube plate is 1.5-2 mm, the distance between the tungsten electrode and the tube wall is 1.5-2 mm, the tungsten electrode is parallel to the tube axis, the arc starting position is 9 points, and the overlapping length of the welding seam is not less than 5 mm. The specification and the end shape of the tungsten electrode influence the allowable current, arc striking, arc stabilizing, weld penetration and weld width. The test requires that the weld joint has larger penetration and smaller fusion width, so that a tungsten electrode with a smaller tip cone angle is used.
During welding, the distance between a tungsten electrode and a tube plate is small, spot welding positioning is carried out, short circuit at the welding point is easy to cause arc breakage, and fusion of two sides of a welding spot is poor, so that the base tube and the tube plate are in an expansion joint mechanical positioning mode, after mechanical expansion positioning, a gap still exists between a tube end and the tube plate, the tube end and a tube hole are tightly attached by a tool for preventing the tube end from flanging inwards, the temperature of the tube end and the tube hole is kept consistent in the welding process, and meanwhile, the tube end and the tube hole are melted to form a common welding pool so as to. The tool is made of stainless steel with the hardness equivalent to that of the base pipe and is processed into a conical flaring structure, the small head is inserted into the gate of the base pipe, the large head side of the tool is properly hammered, the pipe opening of the base pipe is enlarged, and the pipe opening wall is tightly attached to the pipe plate. The effective weld thickness according to the design requirement is not less than 1 time of the pipe wall thickness, namely more than or equal to 0.8 mm. For this reason, the tube sheet does not need to be chamfered, as required above. Because the pipe wall is thin, the pipe end can not be reserved after welding, and the length of the pipe end extending out of the pipe plate is 1.5-2 mm.
The implementation of the welding process of the base pipe and the pipe plate of the thin-wall air cooler shows that:
(1) the pulse TIG welding method can accurately control the welding heat input and the size of a molten pool, and is an optimal welding process for welding the joint of the base pipe and the pipe plate of the stainless steel thin-wall air cooler;
(2) the welding parameters, the position of the tungsten electrode and the shape of the tungsten electrode have important influence on the quality of a base tube-tube plate joint;
(3) proper pipe end extension size is an important condition for obtaining good weld forming and meeting the required weld size;
(4) when the thin-wall pipe is welded with the pipe plate, the pipe orifice is tightly attached to the pipe plate hole by adopting a proper tool, and the important link for ensuring the welding quality is also realized.
Compared with the prior art, the invention has the following beneficial effects: according to the welding process of the base tube and the tube plate of the thin-wall air cooler, the surfaces of a welding test plate and a welding joint are smooth, and the welding seam is uniform. And the split welding seam inspection shows that the root fusion of the welding seam is good, and the size of the welding seam meets the requirement. The process is used for welding products, achieves satisfactory results, and is qualified once through tightness inspection and surface 100% penetration inspection. The operation condition of the installed product is always good, and the phenomenon of pipe end weld joint leakage does not occur.
The above-mentioned embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments may be used, not restrictive; it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications belong to the protection scope of the present invention.
Claims (4)
1. Thin wall air cooler parent tube and tube sheet welding process, its characterized in that: adopting a pulse TIG welding method, wherein a MESSER POLYSUODE welding machine is used as welding equipment, an AUTOTIG250POLYSOUDE power supply is configured with a TS60 handpiece, and an MCP150 programmer is used for programming; the welding parameters were set as follows: pre-gas feeding time is 3s, preheating current is 70A, peak current is 150A, peak time is 120ms, base current is 67A, base time is 200s, welding speed is 100.5mm/min, current decay time is 3s, and gas flow is 8-10L/min; the tungsten electrode is a cerium tungsten electrode with the diameter of 2.5mm, the base tube and the tube plate are in expansion joint in a mechanical positioning mode during welding, a tool is adopted, the tube end is tightly attached to the tube hole, and the length of the tube end extending out of the tube plate is 1.5-2 mm.
2. The thin-walled air cooler base pipe and tube sheet welding process of claim 1, wherein: the tool is made of stainless steel with the hardness equivalent to that of the base pipe and is processed into a conical flaring structure, the small head is inserted into the gate of the base pipe, the large head side of the tool is properly hammered, the pipe opening of the base pipe is enlarged, and the pipe opening wall is tightly attached to the pipe plate.
3. The welding process of the base pipe and the pipe plate of the thin-wall air cooler as claimed in claim 1 or 2, wherein: according to the welding parameters, the distance between the tungsten electrode and the tube plate is 1.5-2 mm, the distance between the tungsten electrode and the tube wall is 1.5-2 mm, the tungsten electrode is parallel to the tube axis, the arc starting position is 9 points, and the overlapping length of the welding seam is not less than 5 mm.
4. The welding process of the base pipe and the pipe plate of the thin-wall air cooler as claimed in claim 1 or 2, wherein: the taper angle of the tip of the tungsten electrode is 20-30 degrees, and the radius of the top end of the tungsten electrode is 0.3-0.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010946275.XA CN112059372A (en) | 2020-09-10 | 2020-09-10 | Welding process for base pipe and pipe plate of thin-wall air cooler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010946275.XA CN112059372A (en) | 2020-09-10 | 2020-09-10 | Welding process for base pipe and pipe plate of thin-wall air cooler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112059372A true CN112059372A (en) | 2020-12-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010946275.XA Pending CN112059372A (en) | 2020-09-10 | 2020-09-10 | Welding process for base pipe and pipe plate of thin-wall air cooler |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60101029A (en) * | 1983-10-20 | 1985-06-05 | アクゾ・エヌ・ヴエー | Method of tightly combining pipe end to pipe bottom |
| JP2003225764A (en) * | 2002-02-05 | 2003-08-12 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for welding thin-walled tube to thick plate |
| CN102019486A (en) * | 2010-11-08 | 2011-04-20 | 哈尔滨北方电力开发有限公司 | Seal welding method of titanium pipe and titanium tube plate of all-titanium condenser |
| CN103170724A (en) * | 2013-03-26 | 2013-06-26 | 苏州森光换热器有限公司 | New tube plate welding method |
| CN103817415A (en) * | 2014-02-26 | 2014-05-28 | 睿能（沈阳）热泵技术有限公司 | Welding method for titanium tube with ultra-thin wall |
| CN105081538A (en) * | 2015-08-25 | 2015-11-25 | 哈电集团（秦皇岛）重型装备有限公司 | Process for automatically welding small-specification thin-walled tube and small-holed axle tube plate |
-
2020
- 2020-09-10 CN CN202010946275.XA patent/CN112059372A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60101029A (en) * | 1983-10-20 | 1985-06-05 | アクゾ・エヌ・ヴエー | Method of tightly combining pipe end to pipe bottom |
| JP2003225764A (en) * | 2002-02-05 | 2003-08-12 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for welding thin-walled tube to thick plate |
| CN102019486A (en) * | 2010-11-08 | 2011-04-20 | 哈尔滨北方电力开发有限公司 | Seal welding method of titanium pipe and titanium tube plate of all-titanium condenser |
| CN103170724A (en) * | 2013-03-26 | 2013-06-26 | 苏州森光换热器有限公司 | New tube plate welding method |
| CN103817415A (en) * | 2014-02-26 | 2014-05-28 | 睿能（沈阳）热泵技术有限公司 | Welding method for titanium tube with ultra-thin wall |
| CN105081538A (en) * | 2015-08-25 | 2015-11-25 | 哈电集团（秦皇岛）重型装备有限公司 | Process for automatically welding small-specification thin-walled tube and small-holed axle tube plate |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201211 |
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| RJ01 | Rejection of invention patent application after publication |