CN102814575A - Deep-groove narrow-gap manual argon arc sealing welding method - Google Patents

Deep-groove narrow-gap manual argon arc sealing welding method Download PDF

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Publication number
CN102814575A
CN102814575A CN2012103039610A CN201210303961A CN102814575A CN 102814575 A CN102814575 A CN 102814575A CN 2012103039610 A CN2012103039610 A CN 2012103039610A CN 201210303961 A CN201210303961 A CN 201210303961A CN 102814575 A CN102814575 A CN 102814575A
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welding
argon arc
argon
adopt
tungsten electrode
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CN102814575B (en
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钟正彬
刘洪�
张涛
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Dongfang Boiler Group Co Ltd
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Dongfang Boiler Group Co Ltd
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Abstract

The invention discloses a deep-groove narrow-gap manual argon arc sealing welding method. The method comprises the following steps of: (1) cleaning before welding: removing oil, rust and water from welding areas, cleaning the welding areas and the peripheries of the welding areas by using acetone, and carrying out drying process by using hot air after washing; (2) forming a first weld bead for the root of a welding seam through sealing welding, carrying out self fluxing without wire filling by adopting manual tungsten argon-arc welding, and enabling the root of the welding seam to be of through welding by adopting the self fluxing current of 100-150 A and the self fluxing voltage of 14-20 V; (3) after self fluxing, carrying out transition by adopting small-diameter argon-arc welding wires through manual tungsten argon-arc welding, and forming a single transition layer for a single bead by adopting a discontinuous wire filling manner, the welding current of 40-60 A and the welding voltage of 12-16 V, thereby reaching welding fluxing; and (4) forming two weld beads in a transition manner by adopting conventional-diameter argon-arc welding wires through manual tungsten argon-arc welding, adopting a continuous wire filling manner, and welding multiple layers for a single bead until the welding is appropriate. The deep-groove narrow-gap manual argon arc sealing welding method disclosed by the invention has the advantages of simple steps, strong manual operability, high welding efficiency and good welded quality.

Description

A kind of deep groove narrow-gap manual argon arc seals welding method
Technical field
The present invention relates to a kind of manual argon arc and seal welding method, relate in particular to the manual argon arc of a kind of tube sheet and heat exchanger tube welding when adopting dark and narrow groove type and seal welding method, belong to the manual argon arc welding technical field.
 
Background technology
GTAW is meant: utilize argon gas to make protection gas, make electrode and heating thermal source with tungsten electrode, weld ferrous metal and non-ferrous metal, thereby obtain the high quality welding joint; During welding, tungsten electrode does not melt, the transition problem of electrodeless metal, and arc phenomenon is fairly simple, and the repeatability of welding procedure is strong, and is easy to operate, is applicable to thin workpiece welding and thick workpiece argon arc welding back cover, all the other electric welding capping work.
The gage of wire that GTAW is commonly used has following specification: 1.6,2.0,2.5,3.0 and 3.2; Wherein, be that 2.5 welding wire is the most commonly used with diameter, be defined as the normal dia argon arc welding wire in this invention, diameter is that 1.6,2.0 welding wire is defined as the minor diameter argon arc welding wire.
Now conventional GTAW technology adopts the welding manner that fills silk continuously, and it is better that this mode is sealed welding effect for the heat exchanger tube of routine and tube sheet, is sealing welding and can't reaching quality requirement of narrow gap deep groove for groove type still.At present domestic in heat exchanger and reactor field, tube sheet seals the weldering groove depth and generally is no more than 2mm, is mostly single V-butt form; Because the design demand of product operating mode is when tube sheet and the dark and narrow groove type of heat exchanger tube welding employing, like the U type groove of little root radius; Groove depth reaches more than the 4-5mm, and width is no more than 4mm, if adopt the traditional hand argon arc to seal welding method; Defectives such as that the root of weld is prone to is lack of penetration, incomplete fusion, bridging; Be not easy to guarantee groove root run quality, secondly, groove is narrow to be unfavorable for that the observation in welding operation and butt welded seam molten bath is prone to produce weld defect.
Summary of the invention
The objective of the invention is to: provide a kind of manual argon arc to seal welding method to the narrow gap of deep groove; Lack of penetration, the incomplete fusion that solves that existing manual argon arc seals that the welding back occurs easily, bridging, the technical problem that weldquality is not high; Thereby can effectively solve the technical problem of dark and narrow groove root run quality, and seal weldering welding efficiency problem because the reasonable Arrangement of welding bead has solved the type with the suitable welding condition of employing.
The object of the invention realizes through following technical proposals: a kind of deep groove narrow-gap manual argon arc seals welding method, and the method includes the steps of:
The first step, preweld cleaning: remove oil, rust and the water of welding region, welding region and periphery thereof are cleaned, after the cleaning, carry out dried with hot blast with acetone;
Second step, seal root of weld portion first road, adopt GTAW not fill silk from molten, adopt from molten electric current 100-150A, molten certainly voltage 14-20V makes root of weld through welding;
The 3rd step, after melting certainly, adopt the transition of minor diameter argon arc welding wire GTAW, adopt and be interrupted the silk filling mode, welding current 40-60A, voltage 12-16V, individual layer single track transition one deck reaches the welding fusion;
The 4th step, adopt normal dia argon arc welding wire GTAW transition twice, adopt continuously to fill silk, the multilayer single-run welding is appropriate.
As a kind of optimal way, before the preweld cleaning of the first step, prepare before doing weldering: according to the size and the degree of depth of groove select the diameter and the shape of welding gun ceramic nozzle, assurance ceramic nozzle can stretch in the groove should the degree of depth; The setting of tungsten electrode, the elongation through the adjustment tungsten electrode makes tungsten electrode stretch into the root of weld; The preparation of welding protection gas: adopting purity is 99.99% bottled argon gas.
As a kind of optimal way, in second step, during welding; Operator's wrist is made every effort to steadily, causes pipe end to ablate in order to avoid tungsten electrode and pipe end are collided, and tungsten electrode stretches into the nearly root of weld seam; Tungsten electrode vertically points to tube sheet, is to burn for fear of pipe, charges into argon flow amount 5-12L/min during welding.
As a kind of optimal way, in the 3rd step, the employing diameter is that the argon arc welding wire of 1.6mm carries out the GTAW transition, during welding, charges into argon flow amount 5-12L/min.
As a kind of optimal way, in step 4, it is appropriate to adopt diameter to be that the conventional argon arc welding wire of 2.5mm carries out the GTAW weldering, during welding, charges into argon flow amount 5-12L/min.
As a kind of optimal way, it is the thorium tungsten WCe-20 of 2.4mm that said tungsten electrode adopts diameter; The WCe-20 tungsten electrode is a kind of model of tungsten electrode, and in the pure tungsten batching, adding mass fraction is the cerium oxide of 1.8%-2.2% and the electrode of impurity≤0.1%; Its advantage is that the x-ray dose and the antioxygenic property of cerium tungsten electrode has bigger improvement than thoriated tungsten electrode; Electron work functon is lower approximately by 10% than thoriated tungsten electrode, and so striking is easier, arc stability is better, and the cerium tungsten electrode possesses also that chemical stability is good, cathode protection is little, pressure drop is low in addition and scaling loss advantage such as less.The diameter that said tungsten electrode adopts is 2.4mm, is because the tungsten electrode of minor diameter is prone to scaling loss, and particularly the scaling loss in molten stage certainly is serious; Large diameter tungsten electrode operation inconvenience, tungsten electrode is prone to and pipe end is collided causes pipe end to ablate.
Compared with prior art, beneficial effect of the present invention: the step that the manual argon arc of the present invention seals weldering is simple, and manual operations property is strong, and the effect imbody after the welding is following:
1) seals root of weld portion first road; Adopt GTAW not fill silk from molten; Avoided because to seal weldering groove root gap little, the molten metal wellability brought of filling silk is not good, defectives such as the root of weld that mobile difference is caused is lack of penetration, incomplete fusion, bridging;
2) after molten certainly, adopt the advantage of minor diameter argon arc welding wire to be to be prone to observe the weld seam molten bath, be beneficial to welding operation, adopt and be interrupted silk filling, the root pass gap is little, and required filling metal is few;
3) after the transition of minor diameter argon arc welding wire GTAW, the weld width that seals weldering becomes greatly gradually, and the operating space increases, and adopts the normal dia welding wire, and welding efficiency is improved, and welding quality is good.
 
Description of drawings
Fig. 1 is the structural representation of soldering opening of the present invention;
Fig. 2 is the microcosmic metallograph with metallographic microscope Nikon EPIPHOT 300 check caulk welds.
Among Fig. 1: 1 for sealing the root of weld portion first road welding bead, and 2 for sealing the weldering second road welding bead, and 3 for sealing weldering the 3rd road welding bead, and 4 for sealing weldering the 4th road welding bead, and 5 is the shell-and-tube heat exchanger tube sheet; 6 is heat exchanger tube.
 
The specific embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Disclosed all characteristics in this specification, or the step in disclosed all methods or the process are except the speciality of mutual repulsion and/or the step; All can make up by any way; Only if special narration all can be replaced by other equivalences or the alternative features with similar purpose, promptly; Only if special narration, an embodiment in a series of equivalences of each characteristic or the similar characteristics.
Embodiment 1
A kind of shell-and-tube heat exchanger tube sheet and heat exchanger tube handwork tungsten electrode argon arc seal weldering
It is as shown in Figure 1,
The material of shell heat exchanger tube sheet 5 is Q245R, thickness 34mm; The material of heat exchanger tube 6 is 20G, and specification is φ 38mm; Heat exchanger tube 6 and tube sheet 5 vertical welding.
Tube sheet and heat exchanger tube specifically to seal welding method following:
1), prepares before the weldering: according to the size of groove and the diameter and the shape of degree of depth selection welding gun ceramic nozzle; Ceramic nozzle can stretch in the groove; Apart from the about 10-12mm of the root of weld, in the present embodiment, select for use the ceramic nozzle model to be: M10 * 45 * 6mm; In addition, should be noted that also the size of magnetic mouth can not influence operator's sight line.
The selection of tungsten electrode: it is the thorium tungsten WCe-20 of 2.4mm that tungsten electrode adopts diameter, and the elongation of adjustment tungsten electrode is 7-8mm, makes tungsten electrode stretch into the root of weld.
The preparation of welding protection gas: adopting purity is 99.99% bottled argon gas.
2), preweld cleaning: remove oil, rust and the water of welding region, welding region and periphery thereof are cleaned, after the cleaning, carry out dried with hot blast with acetone;
3), seal root of weld portion first road 1, adopt GTAW not fill silk from molten, adopt from molten electric current 120A, molten certainly voltage 16V, argon flow amount 8L/min makes root of weld through welding; Burn for fear of pipe, tungsten electrode needs the vertical tube sheet that points to, and hand will be made every effort to steadily during welding operation, causes pipe end to ablate in order to avoid tungsten electrode and pipe end are collided.
4), molten certainly after, the employing diameter is that 1.6mm, model are that the argon arc welding wire of H08SHA carries out the GTAW transition, mainly is that second road 2 is welded in transition; Note observing the size in weld seam molten bath, adopt the silk filling mode, welding current 40A of being interrupted; Voltage 12V; Charge into argon flow amount 8L/min, individual layer single track transition one deck reaches the welding fusion.
5), that the employing diameter is that 2.5mm, model are that the conventional argon arc welding wire of H08SHA carries out the GTAW weldering is appropriate, accomplishes the welding in the 3rd road 3, the 4th road 4, during welding, charges into argon flow amount 11L/min.Adopt continuously to fill silk, the multilayer single-run welding is appropriate.
Process naked eyes macroscopic observation and metallographic microscope: Nikon EPIPHOT 300 micro-examinations, adopt the welding method of sealing of the present invention, the root of weld is shaped good, does not see defective, sees caulk weld microcosmic metallograph shown in Figure 2.
 
Embodiment 2:
A kind of shell-and-tube heat exchanger tube sheet and heat exchanger tube handwork tungsten electrode argon arc seal weldering
The material of shell heat exchanger tube sheet 5 is Q245R, thickness 38mm; The material of heat exchanger tube 6 is 20G, and specification is φ 43mm; Heat exchanger tube 6 and tube sheet 5 vertical welding.
Tube sheet and heat exchanger tube specifically to seal welding method following:
1), prepares before the weldering: according to the size of groove and the diameter and the shape of degree of depth selection welding gun ceramic nozzle; Ceramic nozzle can stretch in the groove; Apart from root of weld 12mm, in the present embodiment, select for use the ceramic nozzle model to be: M10 * 45 * 6mm; In addition, should be noted that also the size of magnetic mouth can not influence operator's sight line.
The selection of tungsten electrode: it is the thorium tungsten WCe-20 of 2.4mm that tungsten electrode adopts diameter, and the elongation of adjustment tungsten electrode is 8-9mm, makes tungsten electrode stretch into the root of weld.
The preparation of welding protection gas: adopting purity is 99.99% bottled argon gas.
2), preweld cleaning: remove oil, rust and the water of welding region, welding region and periphery thereof are cleaned, after the cleaning, carry out dried with hot blast with acetone;
3), seal root of weld portion first road 1, adopt GTAW not fill silk from molten, adopt from molten electric current 150A, molten certainly voltage 18V, argon flow amount 12L/min makes root of weld through welding.
4), molten certainly after, the employing diameter is that 1.6mm, model are that the argon arc welding wire of H08SHA carries out the GTAW transition, mainly is that second road 2 is welded in transition; Note observing the size in weld seam molten bath, adopt the silk filling mode, welding current 40A of being interrupted; Voltage 12V; Charge into argon flow amount 10L/min, individual layer single track transition one deck reaches the welding fusion.
5), that the employing diameter is that 2.5mm, model are that the conventional argon arc welding wire of H08SHA carries out the GTAW weldering is appropriate, accomplishes the welding in the 3rd road 3, the 4th road 4, during welding, charges into argon flow amount 12L/min, adopts continuously to fill silk, the multilayer single-run welding is appropriate.
Process naked eyes macroscopic observation and metallographic microscope: Nikon EPIPHOT 300 micro-examinations, adopt the welding method of sealing of the present invention, the root of weld is shaped good, does not see defective.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (6)

1. a deep groove narrow-gap manual argon arc seals welding method, and it is characterized in that: the method includes the steps of:
The first step, preweld cleaning: remove oil, rust and the water of welding region, welding region and periphery thereof are cleaned, after the cleaning, carry out dried with hot blast with acetone;
Second step, seal root of weld portion first road, adopt GTAW not fill silk from molten, adopt from molten electric current 100-150A, molten certainly voltage 14-20V makes root of weld through welding;
The 3rd step, after melting certainly, adopt the transition of minor diameter argon arc welding wire GTAW, adopt and be interrupted the silk filling mode, welding current 40-60A, voltage 12-16V, individual layer single track transition one deck reaches the welding fusion;
The 4th step, adopt normal dia argon arc welding wire GTAW transition twice, adopt continuously to fill silk, the multilayer single-run welding is appropriate.
2. deep groove narrow-gap manual argon arc as claimed in claim 1 seals welding method; It is characterized in that: before the preweld cleaning of the first step; Prepare before doing weldering: according to the size and the degree of depth of groove select the diameter and the shape of welding gun ceramic nozzle, assurance ceramic nozzle can stretch in the groove should the degree of depth; The setting of tungsten electrode, the elongation through the adjustment tungsten electrode makes tungsten electrode stretch into the root of weld; The preparation of welding protection gas: adopting purity is 99.99% bottled argon gas.
3. deep groove narrow-gap manual argon arc as claimed in claim 1 seals welding method, it is characterized in that: in second step, during welding; It is steady that operator's wrist is made every effort to; Tungsten electrode stretches into the nearly root of weld seam, and tungsten electrode vertically points to tube sheet, charges into argon flow amount 5-12/min during welding.
4. deep groove narrow-gap manual argon arc as claimed in claim 1 seals welding method, it is characterized in that: in the 3rd step, the employing diameter is that the argon arc welding wire of 1.6mm carries out the GTAW transition, during welding, charges into argon flow amount 5-12L/min.
5. deep groove narrow-gap manual argon arc as claimed in claim 1 seals welding method, it is characterized in that: in step 4, it is appropriate to adopt diameter to be that the conventional argon arc welding wire of 2.5mm carries out the GTAW weldering, during welding, charges into argon flow amount 5-12L/min.
6. deep groove narrow-gap manual argon arc as claimed in claim 1 seals welding method, it is characterized in that: it is the thorium tungsten WCe-20 of 2.4mm that said tungsten electrode adopts diameter.
CN201210303961.0A 2012-08-24 2012-08-24 Deep-groove narrow-gap manual argon arc sealing welding method Active CN102814575B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103286528A (en) * 2013-05-29 2013-09-11 东方电气集团东方锅炉股份有限公司 Processing technology for longitudinal-seam narrow-gap welding groove of thick-walled barrels
CN105750697A (en) * 2014-12-15 2016-07-13 无锡市普尔换热器制造有限公司 Titanium alloy heat exchanger argon arc welding technology
CN106378516A (en) * 2016-09-06 2017-02-08 中国第重型机械集团大连加氢反应器制造有限公司 Efficient combined automatic TIG welding technology of butt joint of thick plates
CN108890090A (en) * 2018-09-20 2018-11-27 江苏新宏大集团有限公司 Cobalt-chromium-tungsten alloy nozzle welding procedure
CN109158827A (en) * 2018-09-10 2019-01-08 河北沧润电力工程有限公司 A kind of generating set leakproof hydrogen treatment process

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103286528A (en) * 2013-05-29 2013-09-11 东方电气集团东方锅炉股份有限公司 Processing technology for longitudinal-seam narrow-gap welding groove of thick-walled barrels
CN105750697A (en) * 2014-12-15 2016-07-13 无锡市普尔换热器制造有限公司 Titanium alloy heat exchanger argon arc welding technology
CN106378516A (en) * 2016-09-06 2017-02-08 中国第重型机械集团大连加氢反应器制造有限公司 Efficient combined automatic TIG welding technology of butt joint of thick plates
CN109158827A (en) * 2018-09-10 2019-01-08 河北沧润电力工程有限公司 A kind of generating set leakproof hydrogen treatment process
CN109158827B (en) * 2018-09-10 2021-07-06 河北沧润电力工程有限公司 Hydrogen leakage prevention treatment process for generator set
CN108890090A (en) * 2018-09-20 2018-11-27 江苏新宏大集团有限公司 Cobalt-chromium-tungsten alloy nozzle welding procedure

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