CN101934417A - T-shaped joint welding method - Google Patents
T-shaped joint welding method Download PDFInfo
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- CN101934417A CN101934417A CN2010102967622A CN201010296762A CN101934417A CN 101934417 A CN101934417 A CN 101934417A CN 2010102967622 A CN2010102967622 A CN 2010102967622A CN 201010296762 A CN201010296762 A CN 201010296762A CN 101934417 A CN101934417 A CN 101934417A
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Abstract
The invention discloses a T-shaped joint welding method comprising the following steps of: (a) carrying out backing welding on the main weld of the groove of a side plate, wherein the arc starting position and the arc ending position of the weld are at the longitudinal weld position which is at least 20mm away from the top end of the main weld of the groove of the side plate; (b) cleaning interlayer welding slag, and carrying out intermediate layer welding and cosmetic welding on the main weld of the groove of the side plate, wherein the arc starting position and the arc ending position of the weld are the same as the backing welding in the step (a); (c) removing the arc starting and arc ending welds in the longitudinal weld by using carbon arc gouging at both ends of the main weld of the groove of the side plate, and polishing clean an angular grinding wheel for removing surfaces so as to make the groove ground out; and (d) carrying out the backing welding and the cosmetic welding on the longitudinal angular weld. The T-shaped joint welding method effectively reduces the welding defect of the weld at the T-shaped junction and improves the welding quality of a structure through controlling the arc staring position and the arc ending position of the main weld of the groove of the side plate and removing and polishing the arc starting and arc ending welds.
Description
Technical field
The present invention relates to a kind of welding method, relate in particular to a kind of T junction welding method.
Background technology
The most important welding structural element swing arm of excavator, dipper all are the box Welding Structure, and its side plate and cover plate many places weld seam are formed T font cross-over joint form.As shown in Figure 1, polylith swing arm side plate 3 and two cover plates 4 are welded into box-structure, between side plate and the side plate, form T junction place 5 between side plate and the cover plate.Side plate 3 has groove with cover plate 4 junctions, as shown in Figure 2; The groove type of side plate 3 junctions as shown in Figure 3.Above-mentioned groove place weld seam is the main weld of swing arm, and its welding quality quality is related to the strength grade of swing arm dipper parts and its service life.
Prior art is not done conscientious processing to the welding method of above-mentioned groove place weld seam, only weld by the simple perpendicular requirement in horizontal earlier back, it is more that the result makes that weld seam crack 6 appears in this place, as shown in Figure 4, and the crack of several directions all originates from the intersection of T shape weld seam, and concrete reason is as follows:
1) welding process of each bar weld seam is divided into the starting the arc---welding---receives arc; because of heat is not enough, regular meeting's formation weld seam is narrow, the weld defect of part incomplete fusion during the starting the arc, and incomplete fusion is present in the root of weld; and the intersection of weld seam and mother metal, incomplete fusion declines to a great extent local strength.
2) element of end fusing point constantly flows to the weld seam end owing to good flowability in welding process, concentrate on the center, molten bath of receiving arc at last, make the element ratio of receiving fusing point at the bottom of the arc place other positions far above weld seam, the element of end fusing point comprises at the bottom of sulphur, phosphorus, these material intensities of oxide, tissue looseness, under the effect of the welding shrinkage stress that welding process produces, these places are easy to produce fine cracks.
Existing T font junction weld seam is not starting the arc place of weld seam, is exactly the receipts arc place of weld seam, therefore exists the probability of weld defect and fine cracks very high.Swing arm, dipper in use are to be subjected to the alternate stress effect, the low-intensity node of the weld defect in the weld seam, fine cracks and weld seam regional area destroys concurrent extension gradually and stretches under the alternate stress effect, begin to develop into the observed weld crack of energy, cause whole box-structure heavy damage at last from the fine cracks of microcosmic.Therefore be necessary existing T junction welding method is improved, reduce the weld defect of T font junction weld seam, effectively improve the welding quality of structural member.
Summary of the invention
Technical problem to be solved by this invention provides a kind of T junction welding method, reduces the weld defect of T font junction weld seam, effectively improves the welding quality of structural member.
The present invention solves the problems of the technologies described above the technical scheme that adopts to provide a kind of T junction welding method, comprises the steps: a) to carry out the backing welding of side plate groove main weld: the starting the arc position of weld seam and receipts arc position are at the longitudinal seam place beyond side plate groove main weld top 20mm; B) cleaning interlayer welding slag carries out the intermediate layer of side plate groove main weld and welds and cosmetic welding; The starting the arc of weld seam, to receive the arc position identical with backing welding in the step a); C) with the two ends of side plate groove main weld with carbon arc air gouging will the starting the arc in longitudinal seam, the weld seam of receiving arc removes, and removing face is clean with the angle grinder buffing, grinds groove; D) carry out the backing welding and the cosmetic welding of longitudinal angle weld seam.
Above-mentioned T junction welding method, wherein, the backing welding of described side plate groove main weld: welding current is 260-280A, and arc voltage is 25-29V, below the throat depth 5mm.
Above-mentioned T junction welding method, wherein, weldering of the intermediate layer of described side plate groove main weld and cosmetic welding: welding current is 260-300A, and arc voltage is 28-32V.
Above-mentioned T junction welding method, wherein, the backing welding length of the longitudinal angle weld seam that described side plate groove weld connects is greater than 200mm.
The present invention contrasts prior art following beneficial effect: T junction welding method provided by the invention, starting the arc position by control side plate groove main weld and receive the arc position and to the starting the arc, the weld seam of receiving arc remove, grinding process, reduce the weld defect of T font junction weld seam, effectively improve the welding quality of structural member.In addition, by welding current, arc voltage and fusion length are controlled, further improve the welding quality of structural member.
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Description of drawings
Fig. 1 forms T font welding line structure schematic diagram for the box-shaped structural member weld;
Fig. 2 is the profile along A-A line among Fig. 1;
Fig. 3 is the profile along B-B line among Fig. 1;
Fig. 4 is that T font weld seam intersection forms the crack schematic diagram;
Fig. 5 is the initial schematic diagram of T junction of the present invention place weld seam;
Fig. 6 is a T font weld seam schematic diagram of the present invention.
Among the figure:
3 side plates, 4 cover plates, 5 T junction places
6 cracks, 7 initial weld seam 8 main welds
9 longitudinal angle weld seams
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
Fig. 5 is the initial schematic diagram of T junction of the present invention place weld seam; Fig. 6 is a T font weld seam schematic diagram of the present invention.
See also Fig. 5 and Fig. 6, T junction welding method provided by the invention comprises the steps:
A) backing welding of side plate groove weld; Welding current 260-280A, arc voltage 25-29 V; Below the throat depth 5mm, the starting the arc position of weld seam is from 20mm longitudinal seam place, side plate groove weld top, the receipts arc position of weld seam is from 20mm longitudinal seam place, side plate groove weld top, be the starting the arc and receive arc and be that ［ type is once finished, starting the arc position and receive the arc position from the distance L 1 of main weld 8 greater than 20mm, purpose make the weld seam that has more weld defect the starting the arc, receive the arc end away from main weld 8;
B) intermediate layer of side plate groove weld weldering and cosmetic welding: welding current 260-300A, arc voltage 28-32V, the starting the arc of weld seam, to receive the arc position identical with backing welding, and interlayer must be cleared up welding slag, avoids the pore that causes because of welding slag, slag inclusion weld defect;
C) cleaning at side plate weld seam postwelding both ends: with the two ends of side plate groove weld with carbon arc air gouging will the starting the arc in longitudinal seam, the weld seam of receiving arc removes, and is and removing face is clean with the angle grinder buffing, grinds groove.Purpose is removed the weld seam that has more weld defect;
D) continuity of the length of longitudinal angle weld seam and weld seam: the backing welding length L 2 of the longitudinal angle weld seam 9 that requirement is connected with the side plate groove weld is not less than 200mm; The cap weld of longitudinal angle weld seam T font handing-over director apart from keeping continuously, guarantee the good through welding of this regional inside weld, and weld defect be tending towards minimum.
In sum, T junction welding method provided by the invention, starting the arc position by control side plate groove main weld 8 and receive the arc position and to the starting the arc, the weld seam of receiving arc remove, grinding process, reduce the weld defect of T font junction weld seam, effectively improve the welding quality of structural member.In addition, by welding current, arc voltage and fusion length are controlled, further improve the welding quality of structural member, the quality of swing arm, dipper main weld is greatly improved, underproof repair rate is reduced to below 8%.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (4)
1. a T junction welding method is characterized in that, described method comprises the steps:
A) carry out the backing welding of side plate groove main weld: the starting the arc position of weld seam and receive the arc position at the longitudinal seam place beyond side plate groove main weld top 20mm;
B) cleaning interlayer welding slag carries out the intermediate layer of side plate groove main weld and welds and cosmetic welding; The starting the arc of weld seam, to receive the arc position identical with backing welding in the step a);
C) with the two ends of side plate groove main weld with carbon arc air gouging will the starting the arc in longitudinal seam, the weld seam of receiving arc removes, and removing face is clean with the angle grinder buffing, grinds groove;
D) carry out the backing welding and the cosmetic welding of longitudinal angle weld seam.
2. T junction welding method as claimed in claim 1 is characterized in that, the backing welding of described side plate groove main weld: welding current is 260-280A, and arc voltage is 25-29V, below the throat depth 5mm.
3. T junction welding method as claimed in claim 1 is characterized in that, the intermediate layer weldering and the cosmetic welding of described side plate groove main weld: welding current is 260-300A, and arc voltage is 28-32V.
4. T junction welding method as claimed in claim 1 is characterized in that, the backing welding length of the longitudinal angle weld seam that described side plate groove weld connects is greater than 200mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102967622A CN101934417A (en) | 2010-09-29 | 2010-09-29 | T-shaped joint welding method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102967622A CN101934417A (en) | 2010-09-29 | 2010-09-29 | T-shaped joint welding method |
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| CN101934417A true CN101934417A (en) | 2011-01-05 |
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| CN2010102967622A Pending CN101934417A (en) | 2010-09-29 | 2010-09-29 | T-shaped joint welding method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102632316A (en) * | 2012-03-21 | 2012-08-15 | 包头多维钢构彩板有限公司 | Welding method |
| CN102649191A (en) * | 2012-05-22 | 2012-08-29 | 熔盛机械有限公司 | Method for preventing end part of lug plate of bucket rod of excavator from extended welding line and crack |
| CN105414794A (en) * | 2015-12-31 | 2016-03-23 | 安徽昌永得机械有限公司 | T-shaped joint welding method |
| CN108098332A (en) * | 2018-01-05 | 2018-06-01 | 北京国电龙源环保工程有限公司 | The installation of large-sized boiler air preheater rotor and welding method |
| CN109382568A (en) * | 2017-08-14 | 2019-02-26 | 双叶产业株式会社 | The manufacturing method of component |
| CN110253169A (en) * | 2019-07-05 | 2019-09-20 | 浙江智海化工设备工程有限公司 | A kind of New Large Caliber steel aluminium joint welding method |
| CN110666294A (en) * | 2019-10-24 | 2020-01-10 | 青岛磊金德冲压件有限公司 | Welding method for complex cross structure of weather-resistant steel sleeper beam of railway passenger car |
| CN112605517A (en) * | 2020-12-14 | 2021-04-06 | 西安航天动力机械有限公司 | Method for avoiding arc starting and closing defects of longitudinal seam electron beam welding |
-
2010
- 2010-09-29 CN CN2010102967622A patent/CN101934417A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102632316A (en) * | 2012-03-21 | 2012-08-15 | 包头多维钢构彩板有限公司 | Welding method |
| CN102649191A (en) * | 2012-05-22 | 2012-08-29 | 熔盛机械有限公司 | Method for preventing end part of lug plate of bucket rod of excavator from extended welding line and crack |
| CN102649191B (en) * | 2012-05-22 | 2014-04-23 | 熔盛机械有限公司 | Method for preventing end part of lug plate of bucket rod of excavator from extended welding line and crack |
| CN105414794A (en) * | 2015-12-31 | 2016-03-23 | 安徽昌永得机械有限公司 | T-shaped joint welding method |
| CN109382568A (en) * | 2017-08-14 | 2019-02-26 | 双叶产业株式会社 | The manufacturing method of component |
| CN109382568B (en) * | 2017-08-14 | 2020-10-13 | 双叶产业株式会社 | Method for manufacturing component |
| CN108098332A (en) * | 2018-01-05 | 2018-06-01 | 北京国电龙源环保工程有限公司 | The installation of large-sized boiler air preheater rotor and welding method |
| CN110253169A (en) * | 2019-07-05 | 2019-09-20 | 浙江智海化工设备工程有限公司 | A kind of New Large Caliber steel aluminium joint welding method |
| CN110666294A (en) * | 2019-10-24 | 2020-01-10 | 青岛磊金德冲压件有限公司 | Welding method for complex cross structure of weather-resistant steel sleeper beam of railway passenger car |
| CN110666294B (en) * | 2019-10-24 | 2021-07-13 | 青岛磊金德冲压件有限公司 | Welding method for complex cross structure of weather-resistant steel sleeper beam of railway passenger car |
| CN112605517A (en) * | 2020-12-14 | 2021-04-06 | 西安航天动力机械有限公司 | Method for avoiding arc starting and closing defects of longitudinal seam electron beam welding |
| CN112605517B (en) * | 2020-12-14 | 2022-06-21 | 西安航天动力机械有限公司 | Method for avoiding arc starting and closing defects of longitudinal seam electron beam welding |
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Application publication date: 20110105 |