CN104014909B - Method for welding pipeline - Google Patents

Method for welding pipeline Download PDF

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Publication number
CN104014909B
CN104014909B CN201410289405.1A CN201410289405A CN104014909B CN 104014909 B CN104014909 B CN 104014909B CN 201410289405 A CN201410289405 A CN 201410289405A CN 104014909 B CN104014909 B CN 104014909B
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welding
vertical
arc
downhand
tubing
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CN104014909A (en
Inventor
成鹏
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China Huaye Group Co Ltd
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China Huaye Group Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/16Arc welding or cutting making use of shielding gas
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/235Preliminary treatment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00Articles made by soldering, welding or cutting
    • B23K2101/04Tubular or hollow articles
    • B23K2101/10Pipe-lines

Abstract

The invention provides a kind of method for welding pipeline to comprise: welds prepares, it is right to be organized between two according to clearance requirement by all tubing, and requires the groove of processing tubing according to bevel angle; The selection of welding rod and electric current, according to the diameter of tubing, the thickness of tube wall and the qualification to welding, selects suitable welding rod and electric current; Argon arc welding is utilized to carry out bottoming welding; Electric welding cover big current current interruption welding method is adopted to carry out the welding of filling and capping.Described current interruption welding method, due to the control to welding sequence, welding current, welding rod angle, arcing point and receipts acnode, effectively can improve the qualification rate of pipeline welding.

Description

Method for welding pipeline
Technical field
The present invention relates to a kind of welding method, more specifically, particularly a kind of method for welding pipeline.
Background technology
Heating is indispensable part in winter, and generally adopt boiler to warm oneself in present city, welding is the important component part of boiler quality, the length in fine or not direct relation boiler tube heating surface service life of welding quality.In prior art, the sequential welding welding method of bottom argon arc welding, electric welding cover is got in normal employing, namely with the welding manner of the gimmick of teeter by each root bead bar not current interruption, Fig. 1 is the schematic diagram of prior art sequential welding welding method, welding sequence is via arriving downhand position P1 after a certain vertical position of welding L2 from overhead position Y1, then, more again arriving downhand position P1 from overhead position Y1 via after the L1 of another vertical position of welding, mainly there is following shortcoming in this welding method:
The first, during continuous welding, weldment needs electric arc preheating; When each striking point, weldment belongs to normal temperature, needs to re-use electric arc preheating weldment, and weldment preheating space-time air-capacitor easily invades weld seam, occurs the defect such as slag inclusion and pore;
Second, near the vertical climbing position of facing upward the arc section center between climbing position and vertical position of welding P1 to downhand position P1 of the arc section center between the overhead position Y1 to vertical position of welding L1 or L2 shown in Fig. 1, easily there is indent or saggingly even form overlap in the rising along with weld seam temperature.
3rd, near the downhand position P1 shown in Fig. 1, weld seam temperature constantly raises, and weld seam temperature is wayward, easily occurs that weld seam width is inconsistent.
4th; when vertical position of welding L1, L2 receive arc and joint; welding rod angle conversion is fast; weld seam temperature is too concentrated; easily occur that molten bath and coating depart from, coating does not have protective effect and causes oxygen intrusion in air to occur the excessive defects such as interlayer point slag inclusion, wire clamp slag, pore, needle-like, column, porosity.
5th, in above-mentioned continuous welding process, molten wide at about 1.5mm due to sequential welding, at about 0.7-1.5mm, so need welding rod many, because this increasing welding point, easily there is weld appearance defect in reinforcement.
Because continuous welding method exists above-mentioned shortcoming, so boiler body pipeline welding is in the internal flaw detecting weld seam through X-ray, such as weldering slips, pore, slag inclusion etc., it is 50 percent that low-alloy weld bond detects qualification rate, and carbon steel weld bond is 25 percent, and carbon steel weld bond accounts for the total weld bond of boiler 3/4ths and also wants many, so adopt above-mentioned welding method, the qualification rate of boiler body pipeline welding is very low, cause waste of material, inefficiency, speed of welding slow, and labour cost increases.
Summary of the invention
The present invention is to solve the above-mentioned technical problem that exists in prior art and make, its object is to provide a kind of method for welding pipeline that effectively can improve the qualification rate of pipeline welding.
According to method for welding pipeline of the present invention, it comprises: welds prepares step, and it is right to be organized between two according to clearance requirement by all tubing, and requires the groove of processing tubing according to bevel angle, the step of the selection of welding rod and electric current, according to the diameter of tubing, the thickness of tube wall and the qualification to welding, selects suitable welding rod and electric current, argon arc welding is utilized to carry out the step of bottoming welding, electric welding cover big current current interruption welding method is adopted to carry out the step of the welding of filling and capping, it comprises first half welding sequence and Lower Half welding sequence, horizontal two endpoint locations through tubing axle center are respectively the first vertical position of welding and the second vertical position of welding, the upper extreme point of the vertical line through tubing axle center is downhand position, lower extreme point is overhead position, described downhand position is positioned at the first half, described overhead position is positioned at Lower Half, in described Lower Half welding sequence, all tubing first unification carries out the welding from described overhead position to 1/4 circle segment of the some verticals position of welding described first vertical position of welding and the second vertical position of welding, carry out the welding from described overhead position to 1/4 circle segment of another vertical position of welding described first vertical position of welding and the second vertical position of welding again, in described first half welding sequence, first carry out the welding from the some verticals position of welding described first vertical position of welding and the second vertical position of welding to 1/4 circle segment of described downhand position, then carry out the welding from another vertical position of welding described first vertical position of welding and the second vertical position of welding to 1/4 circle segment of described downhand position.
In addition, preferably, in above-mentioned welding method, in the welding process of any one 1/4 circle segment described, regulation arcing point on the backing run of described 1/4 circle segment carries out the starting the arc, 1/3 of fused bottom argon arc welding residue groove forms molten bath, afterwards, arc is received at 2/3 place forming molten bath, formed and receive arc slope, after before receipts arc place on described receipts arc slope, the striking of 5-10mm place forms the second molten bath to 2/3 place fusing bottom argon arc welding residue groove, arc is received at 1/3 place in the second molten bath, formed and receive arc slope, after before receiving the receipts arc place on arc slope, 5-10mm place striking to fusion groove exceedes 0.5-1mm formation the 3rd molten bath of mother metal, another on the backing run of described circle segment checks and accepts arc.
Beneficial effect
Electric welding cover big current current interruption welding method of the present invention, striking need not shift to an earlier date preheating, avoids air to invade, effectively prevents weld defect; The current interruption welding method that arc is checked and accepted in 3 strikings three effectively can control weld seam temperature and too concentrate and the shrinkage hole that produces and slag inclusion, and each molten bath can be kept overlapping, makes weld reinforcement substantially the same; The cladding efficiency of the fusion penetration energy force rate sequential welding method of current interruption weldering welding method is all high, so welding process center tap is few; Suitably welding frequency and welding rod angle is regulated, so it is consistent to remain to downhand position weld seam width according to welding position is different in welding process.In sum, electric welding cover big current current interruption welding method of the present invention is adopted to weld boiler body pipeline, due to the control to welding sequence, welding current, welding rod angle, arcing point and receipts acnode, effectively can improve the qualification rate of pipeline welding, the internal flaw of weld seam is detected through X-ray, the qualification rate of pipeline welding is more than 95%, and the pipeline qualification rate of skilled welder's welding can reach 100%.
Accompanying drawing explanation
By reference to the content below in conjunction with the description of the drawings and claims, other object of the present invention and result will more be understood and should be readily appreciated that.In the accompanying drawings:
Fig. 1 is the schematic diagram of prior art sequential welding welding method;
Fig. 2 is the schematic diagram that position to be welded placed by the present invention's two tubing;
Fig. 3 is the schematic diagram of current interruption welding method of the present invention;
Detailed description of the invention
In the following description, for purposes of illustration, in order to provide the complete understanding to one or more embodiment, many details have been set forth.But, clearly, also these embodiments can be realized when there is no these details.In other example, one or more embodiment for convenience of description, known structure and equipment illustrate in block form an.
By reference to the accompanying drawings and example electric welding cover big current current interruption welding method of the present invention is illustrated.
Electric welding cover big current current interruption welding method of the present invention comprises the following steps:
(1) step of welds prepares, overlap joint places the steel platform of tubing, to needing all tubing of welding to be grouping on steel platform, particularly, as shown in Figure 2, groove and lower groove in the otch end face processing of often pair of tubing of such as tubing 1 and tubing 2, described bevel angle is within the scope of 60 ° ± 5 °, and root face is 0.5-1mm; Impurity within the scope of the 10-20mm of cut both sides is removed clean, expose metallic luster; Jig is utilized to be grouping by two tubing, the right gap of the group of overhead position Y1 is within the scope of 2.5-3.0mm, because P1 place, downhand position tubing shrinkage factor is larger, so the group of downhand position P1 should be greater than the group of overhead position Y1 to gap to gap, preferably, the group located than overhead position Y1 gap of the group of downhand position P1 is to the large 0.5-1mm in gap.Preferably, the bevel angle sum of two tubing is 60 °, facilitates the arc manipulation of welding rod and the welding of groove.
(2) step of the selection of welding rod and welding current, the electric current of current interruption weldering should in the scope of downhand welding electric current ± 15A, according to the diameter of tubing and the thickness of tube wall, select suitable welding rod and electric current, the welding current that major-diameter thick-wall pipe material selection is larger, and it is different according to welding qualification, select the electric current of current interruption weldering different, the skilled welder grasping welding, in order to accelerate speed of welding and reduce weld defect, the current interruption weldering electric current adopted should be greater than downhand welding electric current, and be not more than downhand welding electric current+15A, new hand welder, speed of welding is slow, when adopting larger current, easily there is the problem of molten bath excessive even burn through tubing, so the current interruption weldering electric current adopted should be not more than downhand welding electric current, and be not less than downhand welding electric current-15A, such as, the tubing of Φ 51*3.5mm (pipe diameter * tubing skin depth), selection Φ 2.5mm welding rod is, downhand welding electric current is 90A, the current interruption weldering electric current that skilled welder adopts is in 90A to 105A scope, the current interruption weldering electric current that new hand welder adopts is in the scope of 75A to 90A.
(3) utilize argon arc welding to carry out the step of bottoming welding, namely adopt argon gas Resistance of Weld Metal to protect, form backing run in groove root.
(4) adopt electric welding cover big current current interruption welding method to carry out the step of filling and arc welding capping, particularly, by all tubing assembled between two, welding process is divided into Lower Half welding sequence and first half welding sequence.As shown in Figure 3, if horizontal two endpoint locations of tubing groove through tubing axle center are respectively the first vertical position of welding L1 and the second vertical position of welding L2, the upper extreme point of vertical line is downhand position P1, lower extreme point is overhead position Y1, with the horizontal axis of tubing for boundary, downhand position P1 is positioned at the first half, and overhead position Y1 is positioned at Lower Half.Can first weld Lower Half or the first half, in figure, the direction of arrow is welding direction.Such as, one total i is to tubing, i is welded the Lower Half of tubing, first first carry out the clockwise welding of overhead position Y1 to the second vertical position of welding L2 from first pair of tubing to the i-th pair tubing, the welding of overhead position Y1 to the counterclockwise welding direction of the first vertical position of welding L1 is carried out again from i-th pair of tubing to the first pair tubing, although the above-mentioned welding to Lower Half is first clockwise direction, the conterclockwise order of another mistake, but the present invention is not limited to this, also can first carries out anticlockwise welding, carry out clockwise welding again; Carry out first half welding after having welded Lower Half, the first half welding weld with Lower Half similar, welded clockwise direction be the second vertical position of welding L2 to downhand position P1, counterclockwise welding direction is that the first vertical position of welding L1 is to downhand position P1.
For the welding process of a pair tubing, its welding direction and welding sequence: carry out welded clockwise towards the second vertical position of welding L2 from overhead position Y1, weld counterclockwise from overhead position Y1 to the first vertical position of welding L1 again, then weld counterclockwise towards downhand position P1 from the first vertical position of welding L1, finally carry out welded clockwise from the second vertical position of welding L2 towards downhand position P1.Below, for above-mentioned welding process, the key step adopting electric welding cover big current current interruption welding method to carry out filling and arc welding capping method is described.
First, when welding 1/4 circle segment of overhead position Y1 to the second vertical position of welding L2, the D1 point starting the arc of 5-10mm on the right side of distance overhead position Y1, welding rod is positioned at D1 point and with the angle of welding direction 70 ° of-85 ° of scopes, when welding rod arrive face upward near climbing position YP time, such as, during about 1/3 ~ 2/3 length range of this 1/4 circle segment, due to the phenomenon that molten bath has nature to drop, accelerate welding frequency, increase the angle of welding rod and welding direction, reduce the increase of iron water amount.Preferably, in about 1/3 ~ 2/3 length range of such as this 1/4 circle segment facing upward climbing position YP near time, the angle of welding rod and welding direction increases by 3 °-5 °.Preferably, when facing upward near climbing position YP, the angle of welding rod and welding direction is 90 °.Welded and face upward after near climbing position YP, the angle of welding rod and welding direction comes back within the scope of 70 °-85 °, until reach C1 point position receipts arc, C1 point position is 5-10mm place on the upside of the second vertical position of welding L2 in Fig. 3.
When carrying out overhead position Y1 to the second vertical position of welding L2 welding, 3 starting the arc and three can be adopted to check and accept the current interruption welding method of arc, namely after the starting the arc of backing run D1 point, after 1/3 of fused bottom argon arc welding residue groove forms molten bath, arc is received at 2/3 place forming molten bath, formed and receive arc slope, after before receiving the receipts arc place on arc slope, the striking of 5-10mm place forms the second molten bath to 2/3 place fusing bottom argon arc welding residue groove, arc is received at 1/3 place in the second molten bath, formed and receive arc slope, after before receiving the receipts arc place on arc slope, 5-10mm place striking to fusion groove exceedes 0.5-1mm formation the 3rd molten bath of mother metal, on backing run, arc is received in C1 point position.Check and accept near arc in above-mentioned 3 starting the arc and three, welding direction of advance paces are larger than the paces of other parts, and preferably, the paces near 3 starting the arc and 3 current interruptions are at 5-10mm, and the paces of other parts are determined according to weld length, are generally 0.5-1mm.According to the starting the arc of above-mentioned position and receipts arc, each molten bath can be kept overlapping, make weld reinforcement substantially the same, reinforcement is about 0.2-0.3mm.
After the welding of overhead position Y1 to the second vertical position of welding L2 completes, carry out the welding of overhead position Y1 to the first vertical position of welding L1, the J1 point starting the arc of 5-10mm on the left of overhead position Y1, after elongating arc sees the weld width of overhead position Y1 to the second vertical position of welding L2 clearly, be moved back into J1 point immediately, force down electric arc, rely on electric arc blow inner formation pool width consistent with the weld width of overhead position Y1 to the second vertical position of welding L2 after, proceed to normal weld, move forward, face upward near climbing position YP when what arrive overhead position Y1 to the first vertical position of welding L1, such as, during 1/3 ~ 2/3 length range of this 1/4 circle segment, increase the angle of welding rod and welding direction, accelerate speed of welding, until reach C2 to check and accept arc.Welding method is welded in the current interruption that three starting the arc and three identical with the welding method of overhead position Y1 to the second vertical position of welding L2 also can be adopted to check and accept arc to the welding of the first vertical position of welding L1 from overhead position Y1.
Complete after from overhead position Y1 to the welding of the first vertical position of welding L1, carry out the welding of the first vertical position of welding L1 to downhand position P1, arcing point is J2, i.e. about 5-10mm place on the downside of the first vertical position of welding L1, receipts acnode is C3, i.e. about 5-10mm place on the left of the P1 of downhand position, welding method is similar from overhead position Y1 to the welding of the first vertical position of welding L1, difference is, when arriving near the P1 of downhand position, the angle of welding rod and welding direction will increase, with face upward near the position YP that climbs with the vertical position LP that climbs near angle identical, preferably, welding rod near the P1 of downhand position and the angle of welding direction are 90 °.
After completing the welding of the first vertical position of welding L1 to downhand position P1, carry out the welding of the second vertical position of welding L2 to downhand position P1, arcing point is about 5-10mm place on the downside of J3, i.e. the second vertical position of welding L2, receipts acnode is about 5-10mm place on the right side of C4, i.e. downhand position P1, and welding method class is with identical to the welding method of downhand position P1 from the first vertical position of welding L1.
Although disclosed content shows exemplary embodiment of the present invention above, it should be noted that under the prerequisite not deviating from the scope of the invention that claim limits, can multiple change and amendment be carried out.The function of the claim to a method described in inventive embodiments described herein, step and/or action need not perform with any particular order.In addition, although element of the present invention can describe or requirement with individual form, also it is contemplated that multiple, is odd number unless explicitly limited.

Claims (8)

1. a method for welding pipeline, comprising:
Welds prepares step, it is right to be organized between two according to clearance requirement by all tubing, and requires the groove of processing tubing according to bevel angle;
The step of the selection of welding rod and electric current, according to the diameter of tubing, the thickness of tube wall and the qualification to welding, selects suitable welding rod and electric current;
Argon arc welding is utilized to carry out the step of bottoming welding;
Electric welding cover big current current interruption welding method is adopted to carry out the step of the welding of filling and capping, it comprises first half welding sequence and Lower Half welding sequence, horizontal two endpoint locations through tubing axle center are respectively the first vertical position of welding and the second vertical position of welding, the upper extreme point of the vertical line through tubing axle center is downhand position, lower extreme point is overhead position, described downhand position is positioned at the first half, described overhead position is positioned at Lower Half, in described Lower Half welding sequence, all tubing first unification carries out the welding from described overhead position to 1/4 circle segment of the some verticals position of welding described first vertical position of welding and the second vertical position of welding, carry out the welding from described overhead position to 1/4 circle segment of another vertical position of welding described first vertical position of welding and the second vertical position of welding again, in described first half welding sequence, first carry out the welding from the some verticals position of welding described first vertical position of welding and the second vertical position of welding to 1/4 circle segment of described downhand position, then carry out the welding from another vertical position of welding described first vertical position of welding and the second vertical position of welding to 1/4 circle segment of described downhand position.
2. method for welding pipeline according to claim 1, is characterized in that,
In the welding process of any one 1/4 circle segment described, regulation arcing point on the backing run of described 1/4 circle segment carries out the starting the arc, 1/3 of fusion bottom argon arc welding residue groove forms molten bath, afterwards, arc is received at 2/3 place forming molten bath, formed and receive arc slope, after before receipts arc place on described receipts arc slope, the striking of 5-10mm place forms the second molten bath to 2/3 place fusing bottom argon arc welding residue groove, arc is received at 1/3 place in the second molten bath, formed and receive arc slope, after before receiving the receipts arc place on arc slope, 5-10mm place striking to fusion groove exceedes 0.5-1mm formation the 3rd molten bath of mother metal, another on the backing run of described circle segment checks and accepts arc.
3. method for welding pipeline according to claim 2, wherein, welds the welding paces of direction of advance within the scope of 5-10mm on the edge, place of the described starting the arc and receipts arc.
4. method for welding pipeline according to claim 1, wherein, in the process of described filling and cover welding, except vertical climbing position, face upward except near climbing position and downhand position, the angle of welding rod and welding direction is within the scope of 70 °-85 °.
5. method for welding pipeline according to claim 4, wherein, in described vertical climbing position, face upward near climbing position and downhand position, the angle of welding rod and welding direction need increase by 3 °-5 °.
6. method for welding pipeline according to claim 4, wherein, in described vertical climbing position, face upward near climbing position and downhand position, the angle of welding rod and welding direction is 90 °.
7. method for welding pipeline according to claim 4, wherein, in described welding process, according to welding position different adjustment welding frequency, in described vertical climbing position, faces upward near climbing position and downhand position and accelerates welding frequency.
8. welding method according to claim 1, wherein, described bevel angle is within the scope of 60 ° ± 5 °.
CN201410289405.1A 2014-06-24 2014-06-24 Method for welding pipeline Active CN104014909B (en)

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CN106166639A (en) * 2016-06-29 2016-11-30 西南石油大学 A kind of welding method of low-alloy pipe line steel
CN106475666B (en) * 2016-11-17 2019-03-26 中国华冶科工集团有限公司 Pipeline narrow gap vertical downward TIG weld method
CN108480820A (en) * 2018-02-26 2018-09-04 中国华冶科工集团有限公司 A kind of plate faces upward a welding method
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