CN102581428A - Ultra-thick forge piece and thin plate butt welding process - Google Patents
Ultra-thick forge piece and thin plate butt welding process Download PDFInfo
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- CN102581428A CN102581428A CN2012100411387A CN201210041138A CN102581428A CN 102581428 A CN102581428 A CN 102581428A CN 2012100411387 A CN2012100411387 A CN 2012100411387A CN 201210041138 A CN201210041138 A CN 201210041138A CN 102581428 A CN102581428 A CN 102581428A
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Abstract
The invention discloses an ultra-thick forge piece and a thin plate butt welding process. The butt welding process is characterized by comprising the following steps of: (1) processing before welding; (2) preheating before welding; (3) welding forge pieces and web plates; and (4) performing postweld heat treatment, wherein the used welding rods, welding wires and welding fluxes all need to be preheated in advance. According to the butt welding process, the problems of deformation and cracks in the ultra-thick forge piece and thin plate butt welding process are really solved, the quality of the product is effectively guaranteed, and the bearing capacity of large vehicles in the traveling process is increased, so that cranes can work safely and reliably.
Description
Technical field
The present invention is specifically related to a kind of metal solder technology, and ultra thick forging docks welding procedure with thin plate in particularly a kind of gantry crane.
Background technology
The thick forging of cart walking mechanism equalizer bar of prior art gantry crane and thin plate are web when welding, and generally require forging thickness to be no more than 40mm, and maximum ga(u)ge is no more than 60mm, and this is because the deficiency that exists in the prior art causes.In cart walking mechanism, forging is thick as too, when forging docks welding with web, is prone to welding deformation and crackle, and welding quality is difficult to control, has a strong impact on its serviceability.If but the thickness of forging then can not bear up the weight of the nearly kiloton of heavy-duty machine as not reaching designing requirement, this has just limited the lifting performance of crane, can not satisfy the demand of shipbuilding industry.
Summary of the invention
The present invention provides a kind of ultra thick forging to dock welding procedure with thin plate, and purpose is to solve the prior art problem, when forging thickness can satisfy the requirement of crane lifting performance, is not prone to welding deformation and crackle after its ultra thick forging and the web welding.
The present invention's technical scheme that adopts of dealing with problems is:
Ultra thick forging docks welding procedure with thin plate, may further comprise the steps;
(1) processing before the welding
Leave the gap between a, web and the weld seam;
The polishing of dirts such as b, the corrosion with groove face and both sides, greasy dirt, dust and iron oxide is clean; The correct setting drawn the blow-out plate, draws the size >=150*150mm of blow-out plate;
(2) preheating before the welding
With heater forging and steel plate are heated preheating, preheat temperature is 125～200 ℃; Forging and sheet material weld after reaching and being incubated 0.5～1 hour after the preheat temperature.
Welding rod, welding wire, solder flux carry out preheating with baking oven before use.
(3) welding of forging and web
A, ground floor backing welding carry out manual welding with φ 3.2 welding rods; Welding finishes and removes welding slag immediately, and beats weldering meat with the electric gun impact.
B, the second layer and the 3rd layer of backing welding carry out manual welding with φ 4 welding rods, weldering meat height≤5mm, and postwelding is removed welding slag, and butt welding meat impacts and beats.
C, middle level and surface weld are used CO
2Semi-automatic gas shielded arc welding, gage of wire are φ 1.2mm, weldering meat height≤4mm, and every layer of welding butt welding meat that finishes impacts and beats; Carrying out CO
2During gas shielded arc welding, must not transport arc, promptly weld width is smaller or equal to three times of gage of wire, thickness≤4mm.
D, having welded should be at interval 5 minutes behind one weld seam, welds second road again.
To keep 125～250 ℃ interlayer temperature in e, the whole welding process.
Behind f, the face bonding access node bundle, back chipping is carried out at the back side go out white; Behind the carbon arc air gouging back chipping, must carry out mechanical grinding by butt welded seam, expose metallic luster.
G, when the welding of sheet material and forging, near the welding in advance of forging position, satisfy the step to expand to the sheet material position.
(4) post weld heat treatment
A, postwelding are taked heat tracing, slow cooling provision, and cooling rate is 80 ℃/h, closes heater when cooling to 100 ℃, and it is cooled off naturally.
B, welding just can carry out nondestructive inspection after must 48 hours, and crackle can not get detecting to prevent to delay time.
Leave 2～3mm gap between web and the weld seam;
The preceding preheating scope of welding is each 75～100mm apart from both sides, weld seam center.
During the ground floor backing welding, welding current A=90～100 ampere, voltage V=22～24 volt, speed of welding is 50～100mm/min.
When the second layer and the 3rd layer of backing welding, welding current electric current A=160～180 amperes, voltage V=22～24 volt, speed of welding is 100～150mm/min.
Middle level and surface weld are used CO
2Semi-automatic gas shielded arc welding when welding, welding current A=140～220 ampere, voltage V=20～30 volt, speed of welding is 100～250mm/min, CO
2Gas flow Q=20～25L/min.
Said welding rod need carry out preliminary treatment before using, and its processing procedure comprises:
(1) welding rod should be dried in high temperature oven, and welding rod oven dry number of times must not surpass secondary;
(2) bake out temperature is 300～350 ℃, dries the welding rod exclusion, and promptly welding rod knocks clear and melodious metal sound each other; Its drying time is decided according to the baking oven size, and the big baking oven time is short, long point of small bake oven time; Welding rod after the oven dry is incubated in baking oven before use always, and holding temperature is 80～120 ℃, and when temperature was lower than 80～120 ℃, baking oven was regulated heating automatically;
(3) the longest service time of welding rod after the oven dry:
In the outside work 4 hours, in the office work 5 hours; Surpass the above time, welding rod must be sent oven dry once more in the baking oven back to.
Said welding wire surface should clean, no greasy dirt, corrosion and bending; Warp cures for 300～350 ℃ before use, dries the welding wire exclusion; Welding wire after the oven dry is incubated in baking oven before use always, and holding temperature is at 80～120 ℃, and when temperature was lower than 80～120 ℃, baking oven was regulated heating automatically.
CO
2Gas purity is not less than 99.5% (volume ratio), and water content is lower than 0.05% (weight ratio), when the bottle internal gas pressure is lower than 1MPa, stops using.
The solder flux that welding is used warp before use cures for 300～350 °, dries the solder flux exclusion, and promptly flux particle falls down and rustles.Solder flux after the oven dry is incubated in baking oven before use always, 80～120 ℃ of holding temperatures, and when temperature was lower than 80～120 ℃, baking oven was regulated heating automatically.
Beneficial effect of the present invention: this welding procedure has solved ultra thick forging conscientiously and has docked welding deformation and crackle with thin plate, has effectively guaranteed the quality of product, has improved the bearing capacity of large vehicle walking, for the crane safety reliability service, has established solid foundation.
The specific embodiment
Below in conjunction with specific embodiment the present invention is explained further details.
Ultra thick forging docks welding procedure with thin plate, may further comprise the steps;
(1) processing before the welding
A, in order to guarantee the weld seam through welding, leave 2～3mm gap between web and the weld seam;
The polishing of dirts such as b, the corrosion with groove face and both sides, greasy dirt, dust and iron oxide is clean; The correct setting drawn the blow-out plate, draws blow-out board size >=150*150mm, and postwelding prescinds and draws the blow-out plate.
(2) preheating before the welding
Heater is arranged in the weld seam front, forging and steel plate are heated preheating, preheat temperature is 125～200 ℃;
The preceding preheating scope of welding is each 75～100mm apart from both sides, weld seam center.
Must be slowly even during preheating, to avoid occurring fire check and distortion;
Forging and sheet material weld after reaching and being incubated 0.5～1 hour after the preheat temperature.
Welding rod, welding wire, solder flux carry out preheating with baking oven before use.
(3) welding of forging and web
A, ground floor backing welding carry out manual welding with φ 3.2 welding rods, electric current A=90～100 ampere, and voltage V=22～24 volt, speed of welding is 50～100mm/min.Welding finishes and removes welding slag immediately, and impacts with electric gun and to beat weldering meat, to eliminate or to reduce welding stress.
B, the second layer and the 3rd layer of backing welding carry out manual welding with φ 4 welding rods, electric current A=160～180 ampere, and voltage V=22～24 volt, speed of welding is 100～150mm/min.Weldering meat height≤5mm, postwelding is removed welding slag, and butt welding meat impacts and beats, to eliminate or to reduce welding stress.
C, middle level and surface weld are used CO
2Semi-automatic gas shielded arc welding, gage of wire are φ 1.2mm, electric current A=140～220 ampere, and voltage V=20～30 volt, speed of welding is 100～250mm/min, CO
2Gas flow Q=20～25L/min.Weldering meat height≤4mm, every layer of welding butt welding meat that finishes impacts and beats, to eliminate or to reduce welding stress; Carrying out CO
2During gas shielded arc welding, must not transport arc, promptly weld width is smaller or equal to three times of gage of wire, thickness≤4mm.
D, having welded should be at interval 5 minutes behind one weld seam, welds second road again, eliminating welding stress, and can guarantee interlayer temperature, avoids long-time welding to cause the overlong time of temperature at peak (1300 ℃).
To keep 125～250 ℃ interlayer temperature in e, the whole welding process, side weld edge fit thermometric, follow according to interlayer temperature too high or too low, selection can continue the heating or the speed of welding that slows down keep interlayer temperature.Be arranged in the weld seam front during preheating before the heater welding simultaneously, begin it to be moved to back of weld after the welding and continue heating, to guarantee the interlayer temperature in the welding process.
Behind f, the face bonding access node bundle, back chipping is carried out at the back side go out white; Behind the carbon arc air gouging back chipping, must carry out mechanical grinding by butt welded seam, expose metallic luster, prevent surperficial carbonization.
G, when the welding of sheet material and forging, near the welding in advance of forging position, satisfy the step to expand to the sheet material position.
(4) post weld heat treatment
A, postwelding are taked heat tracing, slow cooling provision, and cooling rate is 80 ℃/h, closes heater when cooling to 100 ℃, and it is cooled off naturally.
B, welding just can carry out nondestructive inspection after must 48 hours, and crackle can not get detecting to prevent to delay time.
Said welding rod need carry out preliminary treatment before using, and its processing procedure comprises:
(1) welding rod should be dried in high temperature oven, and welding rod oven dry number of times must not surpass secondary;
(2) bake out temperature is 300～350 ℃, dries the welding rod exclusion, and promptly welding rod knocks clear and melodious metal sound each other, and its drying time is decided according to the baking oven size, and the big baking oven time is short, long point of small bake oven time.Welding rod after the oven dry is incubated in baking oven before use always, and holding temperature is 80～120 ℃, and when temperature was lower than 80～120 ℃, baking oven was regulated heating automatically.
(3) the longest service time of welding rod after the oven dry:
In the outside work 4 hours, in the office work 5 hours; Surpass the above time, welding rod must be sent oven dry once more in the baking oven back to.After welding finished, welding rod must return in the storeroom.
Said welding wire package should be intact, and welding wire surface should clean, no greasy dirt, corrosion and bending; Warp cures for 300～350 ℃ before use, dries the welding wire exclusion.Welding wire after the oven dry is incubated in baking oven before use always, 80～120 ℃ of holding temperatures, and when temperature was lower than 80～120 ℃, baking oven was regulated heating automatically.
CO
2Gas purity is not less than 99.5% (volume ratio), and water content is lower than 0.05% (weight ratio), when the bottle internal gas pressure is lower than 1MPa, stops using.
The solder flux that welding is used warp before use cures for 300～350 °, dries the solder flux exclusion, and promptly flux particle falls down and rustles.Solder flux after the oven dry is incubated in baking oven before use always, and holding temperature is 80～120 ℃ of insulations, and when temperature was lower than 80～120 ℃, baking oven was regulated heating automatically.
Solder flux is reused when surpassing 3 times, should add an amount of new solder flux, guarantees that the welding zone quality is good.Flux particle size is tiny evenly, must not use the welding wire of corrosion and the liner inferior that makes moist.
Unspent welding wire and solder flux must return storeroom, particularly solder flux must return hothouse.
Also can adopt above-mentioned technology when welding for the weld seam of other type, when welding, to note following some:
A, welding earlier need the weld seam of nondestructive inspection, treat after the assay was approved, weld other weld seam again;
B, elder generation's weldering slab weld thin plate again;
C, avoid single groove welding as far as possible, preferably adopt the double groove welding, can reduce welding stress and distortion;
D, for long weld seam, suitable two people's symmetries are welded from middle past two limits.
This welding procedure has solved ultra thick forging conscientiously and has docked welding deformation and crackle with thin plate, has effectively guaranteed the quality of product, has improved the bearing capacity of large vehicle walking, for the crane safety reliability service, has established solid foundation.
Claims (10)
1. ultra thick forging docks welding procedure with thin plate, it is characterized in that: may further comprise the steps;
(1) processing before the welding
Leave the gap between a, web and the weld seam;
The polishing of dirts such as b, the corrosion with groove face and both sides, greasy dirt, dust and iron oxide is clean; The correct setting drawn the blow-out plate, draws the size >=150*150mm of blow-out plate;
(2) preheating before the welding
With heater forging and steel plate are heated preheating, preheat temperature is 125～200 ℃; Forging and sheet material weld after reaching and being incubated 0.5～1 hour after the preheat temperature;
Welding rod, welding wire, solder flux carry out preheating with baking oven before use;
(3) welding of forging and web
A, ground floor backing welding carry out manual welding with φ 3.2 welding rods; Welding finishes and removes welding slag immediately, and beats weldering meat with the electric gun impact;
B, the second layer and the 3rd layer of backing welding carry out manual welding with φ 4 welding rods, weldering meat height≤5mm, and postwelding is removed welding slag, and butt welding meat impacts and beats;
C, middle level and surface weld are used CO
2Semi-automatic gas shielded arc welding, gage of wire are φ 1.2mm, weldering meat height≤4mm, and every layer of welding butt welding meat that finishes impacts and beats; Carrying out CO
2During gas shielded arc welding, must not transport arc, promptly weld width is smaller or equal to three times of gage of wire, thickness≤4mm;
D, having welded should be at interval 5 minutes behind one weld seam, welds second road again;
To keep 125～250 ℃ interlayer temperature in e, the whole welding process;
Behind f, the face bonding access node bundle, back chipping is carried out at the back side go out white; Behind the carbon arc air gouging back chipping, must carry out mechanical grinding by butt welded seam, expose metallic luster;
G, when the welding of sheet material and forging, near the welding in advance of forging position, satisfy the step to expand to the sheet material position;
(4) post weld heat treatment
A, postwelding are taked heat tracing, slow cooling provision, and cooling rate is 80 ℃/h, closes heater when cooling to 100 ℃, and it is cooled off naturally;
B, welding must just can be carried out nondestructive inspection after 48 hours.
2. the ultra thick forging described in claim 1 docks welding procedure with thin plate, it is characterized in that: leave 2～3mm gap between web and the weld seam.
3. the ultra thick forging described in claim 1 docks welding procedure with thin plate, it is characterized in that: the preceding preheating scope of welding is each 75～100mm apart from both sides, weld seam center.
4. the ultra thick forging described in claim 1 docks welding procedure with thin plate, it is characterized in that: during the ground floor backing welding, and welding current A=90～100 ampere, voltage V=22～24 volt, speed of welding is 50～100mm/min.
5. the ultra thick forging described in claim 1 docks welding procedure with thin plate, it is characterized in that: when the second layer and the 3rd layer of backing welding, and welding current electric current A=160～180 amperes, voltage V=22～24 volt, speed of welding is 100～150mm/min.
6. the ultra thick forging described in claim 1 docks welding procedure with thin plate, it is characterized in that: middle level and surface weld are used CO
2Semi-automatic gas shielded arc welding when welding, welding current A=140～220 ampere, voltage V=20～30 volt, speed of welding is 100～250mm/min, CO
2Gas flow Q=20～25L/min.
7. the ultra thick forging described in claim 1 docks welding procedure with thin plate, it is characterized in that: said welding rod need carry out preliminary treatment before using, and its processing procedure comprises; (1) welding rod should be dried in high temperature oven, and welding rod oven dry number of times must not surpass secondary;
(2) bake out temperature is 300～350 ℃, dries the solder flux exclusion, and promptly welding rod knocks clear and melodious metal sound each other; Welding rod after the oven dry is incubated in baking oven before use always, and holding temperature is 80～120 ℃, and when temperature was lower than 80～120 ℃, baking oven was regulated heating automatically;
(3) the longest service time of welding rod after the oven dry:
In the outside work 4 hours, in the office work 5 hours; Surpass the above time, welding rod must be sent oven dry once more in the baking oven back to.
8. the ultra thick forging described in claim 1 docks welding procedure with thin plate, it is characterized in that: said welding wire surface should clean, no greasy dirt, corrosion and bending; Warp cures for 300～350 ℃ before use, dries the welding wire exclusion; Welding wire after the oven dry is incubated in baking oven before use always, and holding temperature is 80～120 ℃ of insulations, and when temperature was lower than 80～120 ℃, baking oven was regulated heating automatically.
9. the ultra thick forging described in claim 1 docks welding procedure with thin plate, it is characterized in that: CO
2Gas purity is not less than 99.5% (volume ratio), and water content is lower than 0.05% (weight ratio), when the bottle internal gas pressure is lower than 1MPa, stops using.
10. the ultra thick forging described in claim 1 docks welding procedure with thin plate, it is characterized in that: the solder flux that welding is used warp before use cures for 300～350 °, dries the solder flux exclusion, and promptly flux particle falls down and rustles; Solder flux after the oven dry is incubated in baking oven before use always, and holding temperature is 80～120 ℃ of insulations, and when temperature was lower than 80～120 ℃, baking oven was regulated heating automatically.
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| CN102974949A (en) * | 2012-11-23 | 2013-03-20 | 中远船务（启东）海洋工程有限公司 | Welding process for improving cracking resistance of thick plate welding joint |
| CN104416259A (en) * | 2013-08-28 | 2015-03-18 | 上海凯泉泵业（集团）有限公司 | Welding process of water feed pump of nuclear power plant conventional island |
| CN105127564A (en) * | 2015-08-10 | 2015-12-09 | 安徽富煌钢构股份有限公司 | Submerged-arc welding process of stainless steel plate larger than 80mm in thickness |
| CN105127568A (en) * | 2015-08-10 | 2015-12-09 | 安徽富煌钢构股份有限公司 | Double-metal composite tube welding technique |
| CN105127563A (en) * | 2015-08-10 | 2015-12-09 | 安徽富煌钢构股份有限公司 | CO2 gas shielded welding process of steel structural crossbeam |
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| CN114985879A (en) * | 2022-07-19 | 2022-09-02 | 南京港机重工制造有限公司 | Crane trolley track welding method |
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| CN101633073A (en) * | 2009-08-21 | 2010-01-27 | 长沙金阳机械设备科技开发有限公司 | Process for welding automobile crane subsidiary arm connecting support seat |
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| CN101633073A (en) * | 2009-08-21 | 2010-01-27 | 长沙金阳机械设备科技开发有限公司 | Process for welding automobile crane subsidiary arm connecting support seat |
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| CN102922105A (en) * | 2012-11-16 | 2013-02-13 | 靳红星 | Semi-automatic welding process for self-shielded flux-cored wire |
| CN102974949B (en) * | 2012-11-23 | 2016-01-06 | 中远船务（启东）海洋工程有限公司 | For improving the welding procedure of thick plates joint cracking resistance |
| CN102974949A (en) * | 2012-11-23 | 2013-03-20 | 中远船务（启东）海洋工程有限公司 | Welding process for improving cracking resistance of thick plate welding joint |
| CN104416259A (en) * | 2013-08-28 | 2015-03-18 | 上海凯泉泵业（集团）有限公司 | Welding process of water feed pump of nuclear power plant conventional island |
| CN105127564A (en) * | 2015-08-10 | 2015-12-09 | 安徽富煌钢构股份有限公司 | Submerged-arc welding process of stainless steel plate larger than 80mm in thickness |
| CN105127568A (en) * | 2015-08-10 | 2015-12-09 | 安徽富煌钢构股份有限公司 | Double-metal composite tube welding technique |
| CN105127563A (en) * | 2015-08-10 | 2015-12-09 | 安徽富煌钢构股份有限公司 | CO2 gas shielded welding process of steel structural crossbeam |
| CN105127556A (en) * | 2015-08-10 | 2015-12-09 | 安徽富煌钢构股份有限公司 | CO2 gas shielded welding process of moderate-thickness Q235 steel plate |
| CN105195856B (en) * | 2015-10-27 | 2017-09-15 | 武昌船舶重工集团有限公司 | A kind of steel for ship structure and the horizontal butt welding method of forged steel |
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| CN105195857B (en) * | 2015-10-27 | 2017-08-11 | 武昌船舶重工集团有限公司 | A kind of hull structural steel and the flat butt welding method of forged steel |
| CN105195856A (en) * | 2015-10-27 | 2015-12-30 | 武昌船舶重工集团有限公司 | Transverse-butt-joint welding method for hull structural steel and forged steel |
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| CN106238914A (en) * | 2016-07-29 | 2016-12-21 | 广西安讯科技投资有限公司 | The welding procedure of automobile-used fire-fighting drawdown pump |
| CN110625144A (en) * | 2019-10-21 | 2019-12-31 | 宁波红日工具有限公司 | Cutter and welding process thereof |
| CN110919136A (en) * | 2019-12-13 | 2020-03-27 | 芜湖普威技研有限公司 | Welding process for thick plate and thin plate |
| CN114985879A (en) * | 2022-07-19 | 2022-09-02 | 南京港机重工制造有限公司 | Crane trolley track welding method |
| CN114985879B (en) * | 2022-07-19 | 2023-11-17 | 南京港机重工制造有限公司 | Crane trolley track welding method |
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