CN103752994A - Circular seam welding process of thin-wall container - Google Patents

Circular seam welding process of thin-wall container Download PDF

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Publication number
CN103752994A
CN103752994A CN201310749127.9A CN201310749127A CN103752994A CN 103752994 A CN103752994 A CN 103752994A CN 201310749127 A CN201310749127 A CN 201310749127A CN 103752994 A CN103752994 A CN 103752994A
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CN
China
Prior art keywords
welding
thin
lincoln weld
weld
groove
Prior art date
Application number
CN201310749127.9A
Other languages
Chinese (zh)
Inventor
杨玉慧
张兰芳
杨智问
赵培军
周亚城
顾超
顾其庚
Original Assignee
盐城市锅炉制造有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 盐城市锅炉制造有限公司 filed Critical 盐城市锅炉制造有限公司
Priority to CN201310749127.9A priority Critical patent/CN103752994A/en
Publication of CN103752994A publication Critical patent/CN103752994A/en

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Classifications

    • 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
    • B23K33/00Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
    • 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
    • B23K9/18Submerged-arc welding
    • B23K9/186Submerged-arc welding making use of a consumable electrodes

Abstract

The invention discloses a circular seam welding process of a thin-wall container. The circular seam welding process comprises a workpice backing welding process and a groove filling and covering welding process which are operated in sequence, wherein according to the workpice backing welding process, an argon gas protection shielded welding is used; the groove filling and covering welding process at least comprises three steps of automatic submerged arc welding; in the steps of automatic submerged arc welding, welding wires of the first step of automatic submerged arc welding and the second step of the automatic submerged arc welding lean to parent material side arrangement channels on two sides of a circular seam; welding wires of the third step of automatic submerged arc welding are arranged corresponding to a center position of the circular seam. Due to a plurality of steps of automatic submerged arc welding, the groove is filled and covered during welding the circular seam of the thin-wall container; the defects caused due to the adoption of manual electric-arc welding for filling and covering the groove in the prior art are effectively avoided; the welding quality is effectively improved; compared with shielded metal arc welding covering, the qualified rate is greatly improved; and meanwhile, the production efficiency is also improved.

Description

The girth welding technique of thin-walled header
Technical field
The present invention relates to a kind of girth welding technique, be mainly used in the girth welding of thin-walled header.
Background technology
In the manufacture process of boiler, pressure vessel, welding is important controlling unit, and the situation of its quality directly affects the safe operation of boiler, pressure vessel.Lincoln weld has the advantages such as welding quality is high, productivity ratio is high, working condition is good, therefore my company is according to the feature of the present stage product such as cement kiln, sintering machine, the manufacture of header is large, but our header is that wall ratio is thinner mostly, our improvement of production process, by original manual argon arc welding bottoming+welding rod arc capping, change manual argon arc welding bottoming+Lincoln weld capping into, we are used Lincoln weld capping by test in header welding, have greatly improved welding quality and operating efficiency.
Summary of the invention
The present invention is directed to the deficiencies in the prior art; a kind of girth welding technique of thin-walled header is provided; it welds the method for bottoming, Lincoln weld capping with argon shield; complete the girth welding of thin-walled header; effectively improve welding quality; than SMAW capping qualification rate, greatly improve, meanwhile, also improved production efficiency.
For realizing above technical purpose, the present invention will take following technical scheme:
A kind of girth welding technique of thin-walled header; comprise the workpiece bottoming welding sequence and the groove filling capping welding sequence that carry out successively; described workpiece bottoming welding sequence adopts argon shield weldering; and described groove filling capping welding sequence at least comprises the Lincoln weld that three roads carry out successively; in described San road Lincoln weld; the welding wire of first Lincoln weld, second Lincoln weld is partial to respectively the mother metal Ce Pai road of circumferential weld both sides, and the welding wire of San road Lincoln weld is arranged with the center corresponding to circumferential weld.
As a further improvement on the present invention, the weldingvoltage of first Lincoln weld of the present invention, second Lincoln weld, the Lincoln weld of San road is 33~34V; Welding current is followed successively by: 130~150A, 180~200A, 200~205; Speed of welding is followed successively by 350~450 mm/min, 400~500 mm/min, 300~400 mm/min.
As a further improvement on the present invention, gage of wire of the present invention is φ 1.6mm.
As a further improvement on the present invention, the V-shaped setting of groove type of the present invention.
As a further improvement on the present invention, the electric arc of Lincoln weld of the present invention is in downward welding in the inclined position position; And the distance apart from workpiece vertical center line of welding wire is 10~50mm.
Before carrying out Lincoln weld welding, adjust welding gun rifle head, welding gun rifle head is aimed at the center of welding bead.
According to above technical scheme, with respect to prior art, the present invention has advantages of following:
The present invention adopts multiple tracks Lincoln weld operation, groove while completing the welding of thin-walled circumferential seams of header is filled capping, and first submerged-arc welding wire deflection mother metal one side, the opposite side of second submerged-arc welding wire mother metal deflection mother metal, San road is just over against weld seam center, therefore, effectively overcome available technology adopting manual electric arc welding and completed the defect that groove is filled capping existence; Effectively improve welding quality, than SMAW capping qualification rate, greatly improve, meanwhile, also improved production efficiency.In addition, the present invention is also by improving welding parameter, such as welding current and speed of welding, further to improve the success rate of weld seam.
The specific embodiment
Below the girth welding with Ф 219*8 header is explained to technical scheme of the present invention.
Before weldering, prepare
One, the chemical analysis of mother metal is as shown in following table 1
Table 1
Two, the cleaning of workpiece
Good by table 1 finding Ф 219*8 20G weldability, generally can not produce some defects of cold crack etc.The dirts such as the oil within the scope of the 30mm of weld seam both sides, rust, oxide will be cleaned out.
Three, the bottoming of workpiece welding
It is double V-groove that workpiece bottoming welding adopts argon shield weldering (GTAW) bottoming groove type, according to use experience in the past, selects welding wire, and the trade mark is H08Mn2SiA, and GTAW welding condition is as shown in table 2 below:
Welding method The welding wire trade mark Gage of wire/mm Welding current/A Arc voltage/V Gas flow/Lmin Speed of welding/mm/min
GTAW H08Mn2SiA φ2.5 80~100 9~16 8~12 60~80
Table 2
Four, Lincoln weld capping
Rear employing Lincoln weld capping has been welded in bottoming, argon arc welding bottoming thickness is approximately 2.5mm left and right, because Lincoln weld is inputted large many than welding rod arc welding heat, so we are that while preventing from burning first submerged arc welding, welding wire can not be over against the center of weld seam, but deflection mother metal side little by little, and first submerged-arc welding will adopt little electric current (not burn and to be advisable), during second row road, be partial to the mother metal of opposite side, the center of weld seam is aimed in San road again.The about 15mm(empirical data of Lincoln weld joint coincidence welding) left and right guarantees to receive arc place and fills up arc crater, selecting properly welding condition, adopt rational sweating heat input, be conducive to prevent the generation of various weld defects, be conducive to improve the mechanical performance of joint metal.Lincoln weld (SAW) technological parameter is as shown in table 3:
Welding method Welding wire/solder flux trade mark Gage of wire/mm Welding current/A Arc voltage/V Speed of welding mm/min
SAW 1 H10Mn2/SJ101 φ1.6 130~150 33~34 350~450
SAW 2 H10Mn2/SJ101 φ1.6 180~200 33~34 400~500
SAW 3 H10Mn2/SJ101 φ1.6 200~205 33~34 300~400
Table 3
1, electric arc should be in downward welding in the inclined position position, is beneficial to obtain rounder and more smooth welding bead surface.Welding wire is 10~50mm apart from the distance of cylindrical shell vertical center line, too small effect, the excessive slag inclusion that easily occurs of not having.
2, should be specifically noted that the horizontal tracing of electric arc, when workpiece rotates, may exist and move axially, the distance of electric arc and weld bond both sides is changed, now welder tackles displacement regulating system and should proofread and correct in time.Due to electric arc and welding bead be difficult for to observe, in order to guarantee that welding gun rifle head aims at welding bead center, before weldering, must conscientiously adjust welding gun rifle head and welding bead center.Due to machining deviation (as misalignment) before weldering, because of the actual centering position of welding wire, by solder flux, buried, and be difficult for accurately observing when adjusting and assembling, be difficult to guarantee that groove gap is consistent, make welding wire can not aim at all the time the reasons such as weld seam center in welding process, easily cause the deviation of position while welding.Along with the increase of the welding bead number of plies, rifle head can correspondingly promote simultaneously, to guarantee that stretching out of welding wire is long, does not change.
Ovalitys when 3, the unevenness of surface of the work and workpiece assemble etc., also can cause the fluctuation of welding gun rifle head and surface of the work distance, and welding parameter is changed; Practice shows, because of the improper weld defects such as undercut, slag inclusion and incomplete fusion that easily cause of the distance adjustment between welding wire and groove sidewall.

Claims (6)

1. the girth welding technique of a thin-walled header, comprise the workpiece bottoming welding sequence and the groove filling capping welding sequence that carry out successively, described workpiece bottoming welding sequence adopts argon shield weldering, it is characterized in that: described groove is filled capping welding sequence and at least comprised the Lincoln weld that three roads carry out successively, in described San road Lincoln weld, first Lincoln weld, the welding wire of second Lincoln weld is partial to respectively the mother metal Ce Pai road of circumferential weld both sides, the welding wire of San road Lincoln weld is arranged with the center corresponding to circumferential weld.
2. the girth welding technique of thin-walled header according to claim 1, is characterized in that: the weldingvoltage of described first Lincoln weld, second Lincoln weld, the Lincoln weld of San road is 33~34V; Welding current is followed successively by: 130~150A, 180~200A, 200~205; Speed of welding is followed successively by 350~450 mm/min, 400~500 mm/min, 300~400 mm/min.
3. according to the girth welding technique of thin-walled header described in claim 1 or 2, it is characterized in that: gage of wire is φ 1.6mm.
4. the girth welding technique of thin-walled header according to claim 1, is characterized in that: the V-shaped setting of described groove type.
5. the girth welding technique of thin-walled header according to claim 1, is characterized in that: the electric arc of described Lincoln weld is in downward welding in the inclined position position; And the distance apart from workpiece vertical center line of welding wire is 10~50mm.
6. the girth welding technique of thin-walled header according to claim 1, is characterized in that: before carrying out Lincoln weld welding, adjust welding gun rifle head, welding gun rifle head is aimed at the center of welding bead.
CN201310749127.9A 2013-12-31 2013-12-31 Circular seam welding process of thin-wall container CN103752994A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105081534A (en) * 2015-09-07 2015-11-25 中国兵器科学研究院宁波分院 Tungsten inert gas (TIG) welding method capable of improving arc suppression quality of circumferential weld joint of medium-thin-wall aluminum alloy shell
CN108817605A (en) * 2018-06-05 2018-11-16 鲁西工业装备有限公司 A kind of 6-10mm plate sheet welding technique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1714978A (en) * 2004-06-30 2006-01-04 上海锅炉厂有限公司 Process and device for automatic argon arc welding and narrow gap burial arc welding for circular pipe header seam
CN1714979A (en) * 2004-06-30 2006-01-04 上海锅炉厂有限公司 Automatic welding process and device for long pipe joint in boiler pipe header
CN102806414A (en) * 2012-08-20 2012-12-05 上海锅炉厂有限公司 Automatic welding process for full-through welding or non-full-through welding fillet weld of header pup joint

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1714978A (en) * 2004-06-30 2006-01-04 上海锅炉厂有限公司 Process and device for automatic argon arc welding and narrow gap burial arc welding for circular pipe header seam
CN1714979A (en) * 2004-06-30 2006-01-04 上海锅炉厂有限公司 Automatic welding process and device for long pipe joint in boiler pipe header
CN102806414A (en) * 2012-08-20 2012-12-05 上海锅炉厂有限公司 Automatic welding process for full-through welding or non-full-through welding fillet weld of header pup joint

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
程黎: "埋弧自动焊在锅炉集箱上的应用", 《机械制造与自动化》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105081534A (en) * 2015-09-07 2015-11-25 中国兵器科学研究院宁波分院 Tungsten inert gas (TIG) welding method capable of improving arc suppression quality of circumferential weld joint of medium-thin-wall aluminum alloy shell
CN108817605A (en) * 2018-06-05 2018-11-16 鲁西工业装备有限公司 A kind of 6-10mm plate sheet welding technique

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Application publication date: 20140430

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