CN100450692C - Large posted sides pipeline narrow gap tungsten electrode noble gas protecting all-position automatic soldering method - Google Patents

Large posted sides pipeline narrow gap tungsten electrode noble gas protecting all-position automatic soldering method Download PDF

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CN100450692C
CN100450692C CNB2006101214592A CN200610121459A CN100450692C CN 100450692 C CN100450692 C CN 100450692C CN B2006101214592 A CNB2006101214592 A CN B2006101214592A CN 200610121459 A CN200610121459 A CN 200610121459A CN 100450692 C CN100450692 C CN 100450692C
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welding
scope
root
wire
base value
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CNB2006101214592A
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CN101077547A (en
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范群喜
徐建魁
韩乃山
苑占波
张伟栋
董玉川
唐识
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中国核工业第二三建设公司
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Abstract

The present invention relates to inert gas protected automatic narrow gap tungsten electrode welding process for large thick pipe with diameter over 325 mm and thickness over 40 mm. The automatic welding process includes forming combining chamfer in the opposite ends to be welded before welding, bottoming welding, single layer filling welding, and covering welding in linear or swinging weld pass. The process has less filled deposited metal, low welding cost, high welding efficiency and other advantages.

Description

The pipeline of large posted sides pipeline narrow gap all-position automatic soldering method and manufacturing thereof
Technical field
The present invention relates to a kind of large posted sides pipeline all-position automatic soldering method, especially relate to a kind of use such as the large posted sides pipeline narrow gap tungsten electrode noble gas protecting all-position automatic soldering method.The invention still further relates to the pipeline of making by the posted sides pipeline all-position automatic soldering method.
Background technology
At present; the technology that adopts pipeline all-position to weld automatically mainly contains TIG gas shielded arc welding technology and MIG gas shielded arc welding technology both at home and abroad, and these two kinds of technologies are mainly used (the welding of pipe diameter φ<325mm, pipe thickness h<40mm of welding minor diameter thin wall pipe.(pipe diameter φ 〉=325mm, pipe thickness h 〉=40mm) the common employing of welding is the technology (closing welding procedure hereinafter to be referred as the argon Electricity Federation) of manual argon arc welding bottoming and welding rod arc packing course and capping for large posted sides pipeline, its slope type mostly is two " U " shape combination grooves, the individual layer multi-pass welding is adopted in welding, in Fig. 1 form the argon Electricity Federation close the common bevel for welding pattern that welding procedure relates to, shown that in Fig. 2 the argon Electricity Federation closes the weld seam schematic diagram of the individual layer multi-pass welding of welding procedure welding.
Usually, pipeline all-position auto-welding machine is made up of six major parts such as the source of welding current, TV monitor system, remote controller, welding head, welded rails and welding gun.This welding machine electric power is a kind of pulse inverter, has that arc length is controlled automatically, functions such as monitoring, welding torch transverse swing control, overlapped high-frequency pulse in real time.The adjustable technological parameter of weldering is many automatically for pulse TIG, can accurately control the shape and size in sweating heat input and molten bath, can obtain bigger fusion penetration with lower heat input, thereby reduce welding heat affected zone and weldment distortion.In welding process, pulse current has stronger stirring action to the point-like molten bath, and the molten pool metal condensation is fast, and high-temperature residence time is short, and weld structure is fine and closely woven.This kind equipment provides the basic function of pipeline welding, and given parameter adjustable extent is big, need be when welded pipe line according to technological requirement, select needed welding condition according to the factors such as size, slope type and size of the mother metal of welded pipe line.
For the welding of large posted sides pipeline,, adopt the argon Electricity Federation of above-mentioned pipeline all-position auto-welding machine to close welding procedure and have following shortcoming for groove as shown in Figure 1 commonly used:
1. it is wide that the groove of welding procedure is closed in the argon Electricity Federation, and the loading of welding deposited metal is big, and welding consumable material amount is 4~5 times of groove of narrow gap auto welding technology;
2. it is wide that the groove of welding procedure is closed in the argon Electricity Federation, and the loading of welding deposited metal is big, and welding interval is longer relatively.
3. the argon Electricity Federation pattern and the size of closing the groove of welding procedure determined when welding, and adopts the individual layer multi-pass welding to weld.
Summary of the invention
Close the existing shortcoming of welding procedure groove in order to overcome existing large posted sides pipeline argon Electricity Federation, propose a kind of large posted sides pipeline narrow gap tungsten electrode noble gas protecting all-position automatic soldering method that can improve welding efficiency, reduce filling consumable material amount.For this reason, the function of utilizing existing above-mentioned full-automatic welding equipment to provide of the present invention is developed a kind of slope type of suitable large posted sides pipeline welding and the welding condition of welding the particular range of this kind groove pipeline.The slope type of the large posted sides pipeline welding of this method exploitation can realize that the narrow gap welding of individual layer single track connects, and its groove is called narrow gap groove, and its technology abbreviates narrow gap auto welding technology as.
In the large posted sides pipeline narrow gap tungsten electrode noble gas protecting all-position automatic soldering method that the present invention proposes, diameter 〉=the 325mm of pipeline, wall thickness 〉=the 40mm of pipeline, comprise step: make the opposed end of described pipeline mother metal form the preceding combination of weldering groove, described combination groove comprises groove and following groove, last groove is limited by last bevel angle β, following groove comprises following root face that is limited by following bevel angle α and the root root face of giving prominence to from the bottom of following root face, wherein descend bevel angle α greater than top bevel angle β, last root face intersects with following root face, wherein the scope of root width of root face H1 is 1.0mm~4mm, the scope of root root face width W 1 is 1.5mm~4mm, the scope of the top width W of last groove is 18mm~24mm, and the scope of following bevel angle α is 20 °~60 °; The scope of last bevel angle β is 4 °~10 °; The scope of following groove depth H2 is 8mm~25mm, and group is 0~1.0mm to the scope of clearance G; Pipe interior boring mouth width W 2 scopes: 20mm~60mm; Wherein, described welding method also comprises step: to the welding that feels secure of the bottom of root root face and following root face, fill welding to descending root face and last groove, described filling is welded as the individual layer single-run welding, and cover welding is carried out at the top of last groove.
In said method, in the step of bottoming welding, the voltage base value scope of setting the source of welding current is 0V~5V, the scope of voltage peak is 8.0V~10V, and the scope of electric current base value is 80A~200A, and the scope of current peak is 150A~260A, the base value wire feed rate of welding wire is 0~15inch/min, the peak value wire feed rate of welding wire is 5~20inch/min, and the speed of welding is 2~5inch/min, and the gage of wire scope is φ 0.8mm-φ 1.2mm.
In said method, in the step of filling welding, the voltage base value scope of setting the source of welding current is 0V~5V, the scope of voltage peak is 9V~12V, and the scope of electric current base value is 100A~300A, and the scope of current peak is 180A~380A, the base value wire feed rate of welding wire is 0~65inch/min, the peak value wire feed rate of welding wire is 20~70inch/min, and the speed of welding is 2~6inch/min, and the gage of wire scope is φ 0.8mm-φ 1.2mm.
Preferably, in the step of combination groove, the scope of root width of root face H1 is 2mm~3mm before forming weldering, and the scope of root root face width W 1 is 2mm~3mm, the scope of the top width W of last groove is 18mm~24mm, and the scope of following bevel angle α is 20 °~40 °; The scope of last bevel angle β is 6 °~8 °; The scope of following groove depth H2 is 15mm~25mm, root root face transition arc radius R scope: 1.5mm~3mm, pipe diameter Scope be that 680mm~1000mm, tubing thickness range H3 are 40mm~100mm.
By technique scheme of the present invention, close welding technique with respect to existing argon Electricity Federation, have the following advantages:
1. the groove of narrow gap auto welding technology is narrow, and the loading of welding deposited metal is little, and welding cost is relatively low.
2. the groove of narrow gap auto welding technology can be realized the individual layer single-run welding.
3. narrow gap auto welding technology welding efficiency height, the welding interval of per pass weld bond is short relatively.
Close between the actual welds of welding procedure welding large posted sides pipeline and the actual welds of the present invention shown in Figure 10 B by argon Electricity Federation shown in Figure 10 A and to contrast, the above-mentioned advantage that can find the present invention more intuitively thus and had.
Description of drawings
Fig. 1 is the schematic diagram that the preceding slope type of welding procedure welding large posted sides pipeline welding is closed in existing argon Electricity Federation;
Fig. 2 is the schematic diagram that the many welding beads of individual layer of welding procedure welding large posted sides pipeline are closed in existing argon Electricity Federation;
Fig. 3 is the schematic diagram of the preceding slope type of narrow gap auto welding technology welding according to the present invention;
Fig. 4 is the size cross sectional view according to narrow gap auto welding technology soldering group mould assembly groove of the present invention;
Fig. 5 is the schematic diagram of the welding bead structure of the weld seam according to the present invention;
Fig. 6 is the schematic diagram according to individual layer single-run welding of the present invention;
Fig. 7 is the cross sectional view of first preferred embodiment according to the present invention at the divided edge structure of different pipeline welding position 5GT (tube axis level);
Fig. 8 is that second preferred embodiment according to the present invention is the cross sectional view of 5GT (tube axis level) divided edge structure in the pipeline welding position;
Fig. 9 is that the 3rd preferred embodiment according to the present invention is the cross sectional view of the divided edge structure of 5GT (tube axis level) in the pipeline welding position;
Figure 10 A and Figure 10 B are respectively the pictures that the actual welds and the actual welds that the present invention welds of welding procedure welding large posted sides pipeline are closed in the argon Electricity Federation.
Figure 11 is a section of weld joint size W schematic diagram.
The specific embodiment
The present invention is further described below in conjunction with accompanying drawing and embodiment.
Automatically weld for the thick tube wall pipeline of the major diameter of wall thickness h more than 40mm narrow gap all position, the present invention closes on the basis of welding procedure welding large posted sides pipeline groove in traditional argon Electricity Federation, by test and improvement repeatedly, suitable large posted sides pipeline narrow gap automatic welding process slope type and size have been obtained, as shown in Figure 3, by comparing with the groove that welding procedure welding large posted sides pipeline is closed in traditional argon Electricity Federation shown in Figure 1, the groove width that the present invention proposes has obviously narrowed down, the Breadth Maximum of groove is reduced to 18~24mm, simultaneously the also significant change of planform of groove.
Fig. 4 has shown the schematic diagram of the concrete size of the combined slope type before the posted sides pipeline weldering of the present invention.The opposed end of two heavy wall mother metal pipelines to be welded constitutes the combination groove, this combination groove comprises groove and following groove, last groove is limited by top bevel angle β, following groove comprises following root face that is limited by following bevel angle α and the root root face of giving prominence to from the bottom of bottom root face, wherein descend bevel angle α greater than top bevel angle β, last root face intersects with following root face, gap formation group between two relative root root faces is to root gap G, and has the boring mouth between the inner surface of the bottom of root root face and pipeline mother metal.The shape and size of combination groove of the present invention can be determined by following parameters: 1) root width of root face H1 scope: 1.0mm~4mm; 2) root root face width W 1 scope: 1.5mm~4mm; 3) the top width W scope of last groove: 18mm~24mm; 4) scope of bevel angle α under: 20 °~60 ° (monolateral 10 °~30 °); The scope of top bevel angle β: 4 °~10 ° (monolateral 2 °~5 °); 5) groove depth H2 scope: 8mm~25mm under; 6) the root root face is connected arc radius R scope: 1.5~3mm with the transition of following root face; 7) pipe diameter Scope 325mm, duct thickness scope H3 scope: 40~100mm; 8) pipeline group is 0~1.0mm to the scope of root gap G; 9) boring mouth width W 2 scopes: 20mm~60mm.
The present invention adopts narrow gap auto welding technology on the combination groove of above-mentioned exploitation, develop the welding condition that is complementary, and comprises welding current, weldingvoltage, wire feed rate and speed of welding.Have only suitable welding condition and the slope type that matches and size just can finish the welding of individual layer single track.
Fig. 5 has schematically shown the various piece of the typical process flow of narrow gap auto welding technology of the present invention, comprises bottoming part 10 (ground floor that comprises spot welding, welding is to layer 5), filling part 11 (more than the prime coat to the welding bead that fills up groove) and capping part 12.
Content to narrow gap auto welding technology of the present invention is described below:
The first, reasonably the technological specification parameter comprises welding current (base value and peak value), weldingvoltage (base value and peak value), wire feed rate (base value and peak value), speed of welding (base value and peak value), and shield gas flow rate is the scope that can Gong select for use.
Second, reasonably the technological specification parameter need be according to bottoming (ground floor that comprises spot welding, welding is to layer 5), fill (prime coat more than to the welding bead that fills up groove) and capping is provided with respectively, in the welding process according to section of weld joint size W with weld the suitable adjustment welding parameter of the actual fusion situation of sidewall.Figure 11 illustrates section of weld joint size W.
Bottoming is to guarantee inner surface of pipeline moulding and the good fusion of sidewall in the welding process, and welding parameter compares less.Requirement to energy during filling is not very strict, and importantly guaranteeing not have between the welding bead does not have defectives such as pore, crackle in incomplete fusion and the weld seam.The selection of welding parameter simultaneously must accomplish to have certain efficient.Corresponding to welding parameter, the thickness that welding bead is every layer can be increased to 2.0mm from 1.0mm.According to this requirement, the choose reasonable welding condition.Capping can adopt linear welding bead or weave bead to weld, and reasonably welding parameter mainly is in order to guarantee that figuration of bead is attractive in appearance, to prevent to produce generation of defects such as surperficial incomplete fusion and undercut.
In the welding process of reality,, select the individual layer single track mode of Fig. 6 to weld in conjunction with deposited metal and sidewall fusion situation again according to the section of weld joint width.The face of weld width remained in 10~13mm scope after welding was finished.
Capping part 12 can adopt linear welding bead or weave bead to weld as requested.
Carry out concrete below by specific embodiment to narrow gap auto welding technology of the present invention but be not restrictive description:
First preferred embodiment
With 20# Carbon steel piping carry out 2GT and two welding position engineer testings of 5GT, welding material is selected H08Mn2Si for use The bevel for welding pattern is selected slope type shown in Figure 7 and size for use.
When carrying out the welding of this kind metallic conduit, the pipeline welding position is 2GT, when the welding head relative duct size moves in a circle, has only the horizontal position.The per pass welding condition of this position remains on a fixing value, can not change because of the rotation of head.When the pipeline welding position is 5GT, position more complicated in the welding process, so welding parameter can change slightly because welding torch position is different, a whole circle pipeline welding parameter is the process of a dynamic change.
The groove size of pipeline and crudy have determined the size of welding parameter, and when the bottoming welding, welding current and weldingvoltage are relatively more responsive comparatively speaking to the root width of root face H1 in the groove dimensional parameters, 1 two parameters of root root face width W.Especially when carrying out spot welding, root width of root face H1 has influence to welding current.
Table 1 has been listed in Fig. 7 slope type and size, has three groove examples of different root width of root face H1, is respectively groove 1, groove 2 and groove 3.
Table 1
When carrying out " groove 1 " bottoming welding, because root width of root face H1 size is less than normal relatively, so welding current is relative with the weldingvoltage parameter less, and concrete welding parameter sees Table 1-1.When filling with capping, welding parameter mainly is subjected to the influence of section of weld joint size W; Because three kinds of groove dimensional parameters are identical, so welding parameter is also basic identical.Root face width W 1 will have influence on the size of section of weld joint size W in the groove dimensional parameters, and when root root face width W 1 increases 2 to 4mm, section of weld joint size W also can increase, so the welding current in the welding parameter, weldingvoltage also can increase.
When carrying out " groove 2 " bottoming welding, because root width of root face H1 size is more satisfactory, therefore the spot welding parameter increase the during bottoming of welding current relative with the weldingvoltage parameter " groove 1 ", when carrying out " groove 3 " spot welding, the welding current parameter also can increase equally.The welding condition of " groove 2 " sees Table 1-2; The welding condition of " groove 3 " sees Table 1-3.
Table 1-1
Table 1-2
Table 1-3
Parameter declaration: following is that the peak point current when carrying out spot welding is 170A with the explanation of welding " groove 2 " welding parameter, and background current is 90A; The weldingvoltage peak value of this moment is that the base value of 8V, weldingvoltage is selected all can in 0~5V scope; The solder wire convey velocity peak value can be selected in 5~15inch/min scope, the base value of solder wire convey speed can be selected in 0~10 scope.After spot welding was finished, when guaranteeing that groove root through welding and section of weld joint size W reach certain value, the peak value of welding current was 260A when carrying out the welding of other backing runs, and the base value of welding current is 200A; When carrying out the prime coat welding, the weldingvoltage parameter mainly is subjected to the influence of section of weld joint size W, all remains on basically in 9V~11V scope; The solder wire convey velocity peak values can be selected in 10~25inch/min scope at 10~30inch/min, solder wire convey speed base value, and speed of welding remains between 4.0~6.0inch/min substantially.
When carrying out welding bead filling and capping, weldingvoltage remains in 9~11V scope substantially, speed of welding also is fixing 3~5inch/min range; Changing bigger is welding current, and also from this interval variation of 210A~380A, base value changes in 180A~280A scope the peak value of electric current.When welding current parameter (peak value, base value) changed in an interval, when the peak value of welding current reached maximum as 380A, the base value of welding current also reached maximum 280A.Solder wire convey speed (peak value/base value) cooperates other technological parameter can make suitable selection between 40/30~50/45inch/min according to what of weld(ing) deposit amount.
When carrying out the welding bead capping, select for use linear welding bead to weld earlier, when reaching the weld reinforcement of regulation, adopt weave bead to weld.
By contrast table 1-1, table 1-2 and table 1-3, as can be seen: bottoming welding current parameters changes along with the difference of root width of root face H1, and all the other welding conditions do not have to change substantially, and visible root width of root face H1 directly influences the size and the scope of bottoming welding current.
Stainless steel is different with the carbon steel welding condition, and is mainly relevant with the variation of the diameter of the welding performance of pipe material itself, selected welding material and tube groove size.Under the certain situation of the diameter of slope type and size, welding material, the variation of the welding condition of whole pipe is the process of a dynamic change, has only under the situation that welding parameter is mated each other, could weld out efficient high-quality weld bond.
Above three groove dimensional parameters be the best with groove 2 dimensional parameters.
Second preferred embodiment
With stainless steel material Z3CN20-09M Pipeline carry out welding procedure test, welding material is selected ER316LSi (or ER316L) for use 1.0 groove size and pattern are as shown in Figure 8.
Table 2 has been listed narrow gap all position and has been welded the welding procedure welding automatically The main standard parameter of stainless steel large posted sides pipeline.
Parameter declaration: when carrying out the prime coat welding, what at first carry out is spot welding, and the welding parameter that select this moment is less relatively, is fixed together as long as can guarantee two segment pipes.Welding parameter during spot welding is: peak point current is that 160A, background current are 80A; The welding crest voltage of this moment is 8.5V, base value voltage is can be for selecting in 0~5V scope; The solder wire convey velocity peak value for can in 5~20inch/min scope, select, the base value of solder wire convey speed can be selected in 0~10inch/min scope, at this moment speed of welding is 3.5inch/min.At 60~70L/min, the back-protective shield gas flow rate can be selected in 5~30L/min scope for the flow front of protective gas, the flow of protective gas with protect effect relevant.
Along with the increase of the welding bead number of plies, welded section size (W) constantly increases, and for the fusion that guarantees that sidewall is good, then needs to increase the electric current and the voltage of base value and peak value in welding process.When being welded to layer 5, welding parameter is: the base value that the peak value of welding current reaches 220A, welding current is 130A; The peak value of weldingvoltage reaches the base value of 10V, weldingvoltage and can select in 0~5V scope; The peak value of wire feed rate is that 30inch/min, base value are 25inch/min; Speed of welding 4.5inch/min.
For base value scope 80A~130A median 105A then is to determine by test according to the situation of weldering peak sectional dimension (W); Peak currents range 160A~220A median 190A also is according to the situation of welded section size (W) and definite in welding process.
Same when carrying out weld seam filling and capping, in order to guarantee the sidewall good fusion, according to the fusion situation of weld metal molten bath and sidewall, suitable adjustment welding condition.
Table 2
Same when carrying out weld seam filling and capping, in order to guarantee the sidewall good fusion, according to the fusion situation of weld metal molten bath and sidewall, suitable adjustment welding condition.
So the peak point current of the less employing because section of weld joint size W compares is 220A when just beginning to carry out the welding bead filling, increase along with throat depth, broadening of welding line sectional dimension reaches maximum 360A in order to guarantee the good fusion welding current peak value of sidewall; Base value 130A~270A for welding current makes suitable adjustment according to section of weld joint size W and sidewall fusion situation.
When carrying out the welding bead capping, because welding stress causes the axial shrinkage distortion of pipeline, the process that the section of weld joint size constantly changes is so welding parameter also has the scope of a variation.
From the welding process of the capping that feels secure, welding current, voltage, wire feed rate, the welding machine speed of travel have only mutual coupling, can guarantee the quality of welding bead at pipeline.
The 3rd preferred embodiment:
With stainless steel material Z3CN20-09M Pipeline carry out welding procedure test, welding material is selected ER316LSi (or ER316L) for use 1.0 groove size and pattern are as shown in Figure 9.Concrete welding parameter sees Table 3.Because the parameter declaration and first or second preferred embodiment are similar, need not be described in detail at this.
Table 3
The structural shape of above preferred embodiment and technological parameter thereof are not restrictive.On the basis of the foregoing description, can under different concrete slope types and size, select the resulting corresponding welding condition of welding material of different size for use.In protection scope of the present invention, the those of ordinary skill in the technology of the present invention field can have been done many distortion, variation and improvement in detail to the foregoing description on this basis.

Claims (11)

1, a kind of large posted sides pipeline tungsten electrode noble gas protecting all-position automatic soldering method that is used for, the diameter of described pipeline Wall thickness (H3) 〉=40mm comprises step:
Make the opposed end of described pipeline mother metal form the preceding combination of weldering groove, described combination groove comprises groove and following groove, last groove is limited by last bevel angle (β), following groove comprises following root face that is limited by following bevel angle (α) and the root root face of giving prominence to from the bottom of following root face, wherein descend bevel angle (α) greater than top bevel angle (β), last root face intersects with following root face, wherein the scope of the root width of root face (H1) is 1.0mm~4mm, the scope of root root face width (W1) is 1.5mm~4mm, the scope of the top width of last groove (W) is 18mm~24mm, and the scope of following bevel angle (α) is 20 °~60 °; The scope of last bevel angle (β) is 4 °~10 °; The scope of following groove depth (H2) is 8mm~25mm; Group is 0~1.0mm to the scope of gap (G); Pipe interior boring mouth width (W2) scope is 20mm~60mm,
Wherein, described welding method also comprises step:
To the welding that feels secure of the bottom of root root face and following root face;
Following root face and last groove are carried out multilayer filling welding, and every layer of filling is welded as single-run welding; And
Cover welding is carried out at top to last groove, and linear welding bead or weave bead are adopted in cover welding.
2, method according to claim 1, it is characterized in that, in the step of bottoming welding, the voltage base value scope of setting welding electrical equipment is 0V~5V, and the scope of voltage peak is 8.0V~10V, the scope of electric current base value is 80A~200A, the scope of current peak is 150A~260A, and the base value wire feed rate of welding wire is 0~15inch/min, and the peak value wire feed rate of welding wire is 5~20inch/min, the speed of welding is 2~5inch/min, and the gage of wire scope is
3, method according to claim 1, it is characterized in that, in the step of filling welding, the voltage base value scope of setting welding electrical equipment is 0V~5V, and the scope of voltage peak is 9V~12V, the scope of electric current base value is 100A~300A, the scope of current peak is 180A~380A, and the base value wire feed rate of welding wire is 0~65inch/min, and the peak value wire feed rate of welding wire is 20~70inch/min, the speed of welding is 2~6inch/min, and the gage of wire scope is
4, method according to claim 1, it is characterized in that, in the step of cover welding, the voltage base value scope of setting welding electrical equipment is 0V~5V, and the scope of voltage peak is 9V~12V, the scope of electric current base value is 100A~240A, the scope of current peak is 160A~280A, and the base value wire feed rate of welding wire is 0~55inch/min, and the peak value wire feed rate of welding wire is 15~60inch/min, the speed of welding is 3~5inch/min, and the gage of wire scope is
5, method according to claim 1, it is characterized in that, before forming weldering, make up in the step of groove, the scope of the root width of root face (H1) is 2mm~3mm, the scope of root root face width (W1) is 2mm~3mm, the scope of the top width of last groove (W) is 18mm~24mm, and the scope of following bevel angle (α) is 20 °~40 °; The scope of last bevel angle (β) is 6 °~8 °; The scope of following groove depth (H2) is 15mm~25mm, root root face transition arc radius (R) scope: 1.5mm~3mm, pipe diameter Scope be that 680mm~1000mm, tubing thickness range (H3) they are 40mm~100mm.
6, method according to claim 5, it is characterized in that, in the step of bottoming welding, the voltage base value scope of setting welding electrical equipment is 0V~3V, and the scope of voltage peak is 8.5V~10V, the scope of electric current base value is 80A~160A, the scope of current peak is 160A~240A, and the base value wire feed rate of welding wire is 0~15inch/min, and the peak value wire feed rate of welding wire is 5~20inch/min, the speed of welding is 3~5inch/min, and the gage of wire scope is φ 0.8mm-φ 1.2mm.
7, method according to claim 5, it is characterized in that, in the step of filling welding, the voltage base value scope of setting welding electrical equipment is 0V~3V, the scope of voltage peak is 9.5V~10.5V, the scope of electric current base value is 100A~240A, the scope of current peak is 180A~340A, the base value wire feed rate of welding wire is 30~65inch/min, the peak value wire feed rate of welding wire is 35~70inch/min, the speed of welding is 3~6inch/min, and the gage of wire scope is φ 0.8mm-φ 1.2mm.
8, method according to claim 5, it is characterized in that, in the step of cover welding, the voltage base value scope of setting welding electrical equipment is 0V~3V, and the scope of voltage peak is 10V~12V, the scope of electric current base value is 110A~220A, the scope of current peak is 170A~240A, and the base value wire feed rate of welding wire is 0~45inch/min, and the peak value wire feed rate of welding wire is 10~50inch/min, the speed of welding is 3~6inch/min, and the gage of wire scope is φ 0.8mm-φ 1.2mm.
9. according to the described method of one of claim 1-8; it is characterized in that; the material of described pipeline is in the following material: stainless steel, carbon steel, steel alloy, and the protective gas of welding is one in the following gas: the mixed inert gas of argon gas, helium or argon gas and helium.
10. according to the described method of one of claim 1-8, it is characterized in that the material of described pipeline is that stainless steel and described protective gas are argon gas.
11. the pipeline that the described welding method of one of a utilization such as claim 1-10 is made is characterized in that the width of the outer surface of weld seam is 10-13mm.
CNB2006101214592A 2006-08-25 2006-08-25 Large posted sides pipeline narrow gap tungsten electrode noble gas protecting all-position automatic soldering method CN100450692C (en)

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