CN103962685B - Underwater electrode half dry type overhead welding method - Google Patents
Underwater electrode half dry type overhead welding method Download PDFInfo
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- CN103962685B CN103962685B CN201410172230.6A CN201410172230A CN103962685B CN 103962685 B CN103962685 B CN 103962685B CN 201410172230 A CN201410172230 A CN 201410172230A CN 103962685 B CN103962685 B CN 103962685B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/0061—Underwater arc welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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Abstract
The invention provides a kind of underwater electrode half dry type overhead welding method, the method comprising the steps of is: first the welding machine special under water carefully connecting the wire is placed and connected appropriate; Will be under water welding rod special for special be fixed in welding gun, then two under water welder pull the plug, a welder is positioned over the welding rod sandwiching in welding gun in the workpiece grooves to be welded at overhead position place, and it is to be welded to hold welding gun; Another welder is placed in parallel in water barrier and each one of elastic layer on briquetting; Then another welder that water barrier and welding rod are closely compressed is to be welded, adjust welding parameter, open the source of welding current, starting rod striking welding rod special for special is implemented welding, after electric arc ignites in the small space of water barrier and workpiece to be welded automatic combustion, automatically blow-out, welding operation is complete. Effect of the present invention is that the method realizes the welding of underwater electrode overhead position, makes the maximum hardness of weld metal zone and heat affecting respectively from 400HV10And 250HV10Drop to 350HV10And 210HV10, and the content 45ml/100g of postwelding deposited metal diffusible hydrogen has dropped to 16ml/100g, reduces welder's labour intensity.
Description
Technical field
The present invention relates to UNDERWATER REPAIR WELDING FOR field, particularly relate to a kind of underwater electrode half dry type overhead welding method.
Background technology
Underwater electrode arc welding technology can be realized the manual welding operation of downhand welding (1G position) and vertical position welding (3G position) easily at present, but overhead welding (4G position) operation also exists a lot of difficulties. But, in the repairing of the many places such as maintenance, ocean structure facility of Ocean Oil And Gas Pipeline, often can run into again the welding of overhead position, therefore need to design a kind of novel welding method and solve this problem.
The inventive method is to put forward on tradition is lain the basis of bar weldering. The bar of lying in early time weldering is mainly used in land welding field, and what the earliest the bar weldering of lying is applied to Underwater Welding is Japan, and they once applied the bar weldering of lying the welding of downhand welding under water and two positions of fillet welding. But successfully the bar weldering of lying is applied to the weld job of overhead position under water there are no people.
Summary of the invention
For deficiency of the prior art, the object of this invention is to provide a kind of underwater electrode half dry type overhead welding method, to realize the good welds of wet method overhead position under water.
For achieving the above object, the technical solution used in the present invention is to provide underwater electrode half dry type overhead welding method, and the method includes following steps:
1) first the welding machine special under water carefully connecting the wire is positioned on land or boats and ships, then draw respectively two wires from the both positive and negative polarity of welding machine, stretch in water, article one, wire is connected with welding gun, another wire is considered as ground wire, the positive pole of the wire welder being connected with welding gun, the negative pole of another wire welder;
2) welding rod special for special is fixed in welding gun under water, select the welding rod special for special under water of the UN-CS series of broco company of U.S. production, then two under water welder pull the plug, a welder is positioned over the welding rod sandwiching in welding gun in the workpiece grooves to be welded at overhead position place, and it is to be welded to hold welding gun;
3) another welder is placed in parallel in the water barrier of getting ready in advance and each one of elastic layer on briquetting; Described elastic layer and briquetting next-door neighbour, water barrier is positioned on elastic layer; Then another welder places welding rod and compresses welding rod being placed with on the briquetting of water barrier and elastic layer, water barrier and welding rod is closely compressed, then step 2) a welder hold up and press piece, to keep above-mentioned each parts mutual alignment;
4) step 3) another welder the wire that is considered as ground wire is inserted between felt and workpiece to be welded, step 2) a welder hold the wire holding position that is considered as ground wire and fix, then step 3) another welder by bundling belt, briquetting and workpiece to be welded are bundled and are tightened in the lump, step 2) a welder unclamp briquetting and be considered as the wire of ground wire;
5) shore man adjusts welding parameter by welding machine special under water, and welding parameter is selected the welding current of 120A and the weldingvoltage of 28-30V, the Master2850 special welding power supply under water of selecting KEMPPI company to produce;
6) shore man opens the source of welding current, step 2) a welder by a metal starting rod striking welding rod special for special, and with workpiece short circuit to be welded, then mention rapidly starting rod, electric arc is just ignited, after electric arc ignites in the small space of water barrier and workpiece to be welded automatic combustion, until burn down whole root bead bar, automatically blow-out, welding operation is complete.
Effect of the present invention is:
1, the method can realize the underwater electrode overhead position welding that was in the past difficult to realization.
2, compared with traditional underwater wet welding method, this method is welded constantly, due to welding rod not mobile water around, and the insulation effect of water barrier and elastic layer material, can make the cooling velocity of postwelding reduce half left and right, this can make the hardness of postwelding and diffusible hydrogen content reduce, and result of the test shows that the maximum hardness of weld metal zone and heat affecting is respectively from 400HV compared with the tradition manual downhand welding of wet method under water10And 250HV10Drop to 350HV10And 210HV10, and the content 45ml/100g of postwelding deposited metal diffusible hydrogen has dropped to 16ml/100g, has nearly reduced by 2/3.
3, compared with traditional underwater wet welding method, the method is simple to operate, no matter has the staff of welding experience all can complete, and can save welder's cultivation fee and use;
4, due to the electric arc that only workpiece need be assembled and ignites of welder in whole welding process, and do not need own welding, therefore, compared with traditional method, the method working environment is better, and welder's labour intensity reduces;
Brief description of the drawings
Fig. 1 is that half dry type overhead welding method of the present invention Organization Department of the CPC Central Committee part assembles main pseudosection;
Fig. 2 is that half dry type overhead welding method of the present invention Organization Department of the CPC Central Committee part assembles left pseudosection;
Fig. 3 is the schematic diagram of specific embodiment of the invention assembly figure;
Fig. 4 is postwelding formed weld sample of the present invention.
In figure:
1, workpiece 2 to be welded, water barrier 3, elastic layer 4, briquetting 5, welding rod
6, weld seam 7, bundling belt
Detailed description of the invention
By reference to the accompanying drawings underwater electrode half dry type overhead welding method of the present invention is illustrated.
Underwater electrode half dry type overhead welding method design philosophy of the present invention is to be to burn in by a narrow space between flexible water barrier and workpiece at one based on: the method welding arc in welding process. On the one hand seawater abrim in water barrier, electric arc still burns in a wet environment, on the other hand, water barrier can separate electric arc and a large amount of mobile water around again, electric arc does not have flowable water around, this and the welding of common wet method are different again, therefore by its called after half dry type overhead welding method.
As shown in Figure 1 and Figure 2, underwater electrode half dry type overhead welding method of the present invention, the method includes following steps:
1) first the welding machine special under water carefully connecting the wire is positioned on land or boats and ships, then draw respectively two wires from the both positive and negative polarity of welding machine, stretch in water, article one, wire is connected with welding gun, another wire is considered as ground wire, the positive pole of the wire welder being connected with welding gun, the negative pole of another wire welder;
2) welding rod special for special is fixed in welding gun under water, select the welding rod special for special under water 5 of the UN-CS series of broco company of U.S. production, then two under water welder pull the plug, a welder is positioned over the welding rod sandwiching in welding gun in the workpiece grooves to be welded at overhead position place, and it is to be welded to hold welding gun;
3) another welder is placed in parallel in the water barrier of getting ready in advance 2 and each one of elastic layer 3 on briquetting 4; Described elastic layer 3 is close to briquetting 4, and water barrier 2 is positioned on elastic layer 3; Then another welder places welding rod and compresses welding rod being placed with on the briquetting 4 of water barrier 2 and elastic layer 3, water barrier 2 and welding rod is closely compressed, then step 2) a welder hold up and press piece 4, to keep above-mentioned each parts mutual alignment;
4) step 3) another welder the wire that is considered as ground wire is inserted between felt and workpiece to be welded, step 2) a welder hold the wire holding position that is considered as ground wire and fix, then step 3) another welder by bundling belt 7, briquetting 4 and workpiece to be welded 1 bundles and are tightened in the lump, step 2) a welder unclamp briquetting 4 and be considered as the wire of ground wire;
5) shore man adjusts welding parameter by welding machine special under water, and welding parameter is selected the welding current of 120A and the weldingvoltage of 28-30V, the Master2850 special welding power supply under water of selecting KEMPPI company to produce;
6) shore man opens the source of welding current, step 2) a welder by a metal starting rod striking welding rod special for special, and with workpiece 1 short circuit to be welded, then mention rapidly starting rod, electric arc is just ignited, after electric arc ignites in the small space of water barrier 2 and workpiece 1 to be welded automatic combustion, until burn down whole root bead bar, automatically blow-out, welding operation is complete.
Described water barrier 2 is made for felt, and elastic layer 3 is made for sponge, and briquetting 4 is selected the cuboid steel plate of the making of Q345 material.
Underwater electrode half dry type overhead welding method of the present invention is achieved in that
The sequence of positions of the each parts of underwater electrode half dry type overhead welding method of the present invention is workpiece 1 to be welded, welding rod special for special 5, water barrier 2, elastic layer 3 and briquetting 4 under water from top to bottom successively. Wherein the effect of water barrier 2 is in order welding rod and mobile around water to be separated, to increase the stability of arc burning, reduce the cooling velocity of postwelding, also playing in addition the effect of forced shaping. The effect of elastic layer 3 is to make when pressing briquetting 4 each position of welding rod can be stressed more even, makes water barrier 2 and the welding rod special for special 5 under water can better close contact, thus the water proof effect of raising water barrier 2.
The implementation procedure of underwater electrode half dry type overhead welding method of the present invention is:
When welding, select welding machine special under water, welding current is 130A, selection of electrodes underwater electrode, and core diameter is 4.0mm, and water barrier 2 is selected felt, and elastic layer 3 is selected sponge, and briquetting 4 adopts bundling belt to fix. When experiment, the installation diagram of each parts as shown in Figure 3. Preparatory stage before weldering, first the welding rod being loaded in welding gun is positioned on workpiece to be welded, then the briquetting 4 that is fixed with water barrier 2 and elastic layer 3 is held to welding rod special for special under water 5 being pressed in workpiece to be welded tightly from below, then with bundling belt, workpiece 1 to be welded and 4 one of briquettings are tied up, make it compress sponge and felt to fix briquetting 4. The positive pole of the source of welding current is connected to welding gun, and negative pole is connected with workpiece. After assembling, open the source of welding current, thereby and touch electrode tip with a metal starting rod and make itself and the workpiece to be welded 1 short circuit electric arc that ignites, will be in the small space of water barrier and workpiece to be welded 1 after electric arc ignites automatic combustion, until burn down whole root bead bar. In whole welding process, electric arc smooth combustion along with the fusing of welding rod special for special 5 is under water moved to welding rod afterbody gradually between electrode tip and workpiece to be welded 1 is always welded and is automatically stopped after whole root bead bar all burnt. After once having welded, felt has obvious scaling loss and carbonization near the one side of welding rod, and welding next time needs to change. And the sponge that is positioned at outside generally can scaling loss can repeatedly not used.
Postwelding shaping situation as shown in Figure 4, visible face of weld is smooth, and sprawl well continuously by deposited metal, and lines is shaped attractive in appearance.
Claims (2)
1. a underwater electrode half dry type overhead welding method, the method includes following steps:
1) first the welding machine special under water carefully connecting the wire is positioned on land or boats and ships, then draw respectively two wires from the both positive and negative polarity of welding machine, stretch in water, article one, wire is connected with welding gun, another wire is considered as ground wire, the positive pole of the wire welder being connected with welding gun, the negative pole of another wire welder;
2) welding rod special for special is fixed in welding gun under water, select the welding rod special for special under water (5) of the UW-CS series of broco company of U.S. production, then two under water welder pull the plug, one welder is positioned over the welding rod sandwiching in welding gun in the workpiece grooves to be welded at overhead position place, and it is to be welded to hold welding gun;
3) another welder is placed in parallel in the water barrier of getting ready in advance (2) and each one of elastic layer (3) on briquetting (4); Described elastic layer (3) and briquetting (4) next-door neighbour, water barrier (2) is positioned on elastic layer (3); Then another welder places welding rod and compresses welding rod upper the briquetting (4) that is placed with water barrier (2) and elastic layer (3), water barrier (2) and welding rod are closely compressed, then step 2) a welder hold up and press piece (4), to keep above-mentioned each parts mutual alignment;
4) step 3) another welder the wire that is considered as ground wire is inserted between water barrier (2) and workpiece to be welded, step 2) a welder hold the wire holding position that is considered as ground wire and fix, then step 3) another welder by bundling belt (7), briquetting (4) and workpiece to be welded (1) are bundled and are tightened in the lump, step 2) a welder unclamp briquetting (4) and be considered as the wire of ground wire;
5) shore man adjusts welding parameter by welding machine special under water, and welding parameter is selected the welding current of 120A and the weldingvoltage of 28-30V, the Master2850 special welding power supply under water of selecting KEMPPI company to produce;
6) shore man opens the source of welding current, step 2) a welder by a metal starting rod striking welding rod special for special, make workpiece to be welded (1) short circuit, then mention rapidly starting rod, electric arc is just ignited, after electric arc ignites in the small space of water barrier (2) and workpiece to be welded (1) automatic combustion, until burn down whole root bead bar, automatically blow-out, welding operation is complete.
2. underwater electrode half dry type overhead welding method according to claim 1, it is characterized in that: described water barrier (2) is felt making, elastic layer (3) is made for sponge, and briquetting (4) is for selecting the cuboid steel plate of Q345 material making.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410172230.6A CN103962685B (en) | 2014-04-28 | 2014-04-28 | Underwater electrode half dry type overhead welding method |
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| CN201410172230.6A CN103962685B (en) | 2014-04-28 | 2014-04-28 | Underwater electrode half dry type overhead welding method |
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| CN103962685A CN103962685A (en) | 2014-08-06 |
| CN103962685B true CN103962685B (en) | 2016-05-18 |
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| CN108080772A (en) * | 2017-12-18 | 2018-05-29 | 西安航天动力机械有限公司 | A kind of assembled arc-welding method |
| CN116833514B (en) * | 2023-05-25 | 2024-05-28 | 天津大学 | Welding method for improving all-position welding quality of marine riser 5G and product thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2023476A (en) * | 1978-06-16 | 1980-01-03 | Boc Subocean Services Ltd | Arc welding underwater |
| US4527046A (en) * | 1982-04-26 | 1985-07-02 | Osmo Asonen | Method and arrangement for underwater arc welding |
| WO1989002332A1 (en) * | 1987-09-16 | 1989-03-23 | Oy Gss General Sea Safety Ltd | Arc welding method and longitudinal arc welding means |
| SU1551490A1 (en) * | 1988-02-15 | 1990-03-23 | Ленинградский Кораблестроительный Институт | Method of underwater free-cracker welding |
| US6153847A (en) * | 1997-06-06 | 2000-11-28 | Mitsui Engineering & Shipbuilding Company | Welding member and welding method |
-
2014
- 2014-04-28 CN CN201410172230.6A patent/CN103962685B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2023476A (en) * | 1978-06-16 | 1980-01-03 | Boc Subocean Services Ltd | Arc welding underwater |
| US4527046A (en) * | 1982-04-26 | 1985-07-02 | Osmo Asonen | Method and arrangement for underwater arc welding |
| WO1989002332A1 (en) * | 1987-09-16 | 1989-03-23 | Oy Gss General Sea Safety Ltd | Arc welding method and longitudinal arc welding means |
| SU1551490A1 (en) * | 1988-02-15 | 1990-03-23 | Ленинградский Кораблестроительный Институт | Method of underwater free-cracker welding |
| US6153847A (en) * | 1997-06-06 | 2000-11-28 | Mitsui Engineering & Shipbuilding Company | Welding member and welding method |
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