CN101786196A - Single-side union melt automatic welding method of ceramic backing with I-shaped joint or Y-shaped groove - Google Patents
Single-side union melt automatic welding method of ceramic backing with I-shaped joint or Y-shaped groove Download PDFInfo
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- CN101786196A CN101786196A CN201010113237A CN201010113237A CN101786196A CN 101786196 A CN101786196 A CN 101786196A CN 201010113237 A CN201010113237 A CN 201010113237A CN 201010113237 A CN201010113237 A CN 201010113237A CN 101786196 A CN101786196 A CN 101786196A
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Abstract
The invention discloses a single-side union melt automatic welding method of a ceramic backing with an I-shaped joint or a Y-shaped groove, comprising the following steps of: (1) padding the bottoms of two parent metals to be welded with ceramic welding backings, and enabling the gap between the two parent metals with I-shaped joints to be 2-3mm or the gap between bottom straight joint parts between the two parent metals with Y-shaped grooves to be 3.5-4mm; and (2) welding at the positions of the I-shaped joints or the Y-shaped joints of the two parent metals to be welded from bottom up by adopting a union melt welding machine under the operation conditions that the current is 750-850A, the voltage is 38-42V and the travelling speed of the welding machine is 18-19.5m/h. By adopting the process, welding lines can meet the demand that the mechanical property and the processing property of a welding joint are respectively higher than those of the parent metals, and lifting equipment enabling workpieces to turn over is not needed. Moreover, welding sticks are saved, welding levels are reduced and the welding residual stress and the edge angular distortion are reduced to the least limit.
Description
Technical field
The present invention relates to a kind of single face Lincoln weld, particularly a kind of I shape or single V groove with root face ceramic substrate single face Lincoln weld method.
Background technology
In one of present welding code JB/T47109-2000 " GB150-1998 welding code " standard lexical or textual analysis one literary composition, the principle of selecting for use of I shape groove, single V groove with root face had following regulation when the Lincoln weld of narrow gap was welded: " characteristics of I shape groove, it is fit to the efficient welding of thin plate and cut deal.Weldering is finished together during single welding, and during welding by both sides, inside and outside (positive and negative) each weldering is finished together.The maximum thickness of slab 12mm of single welding ... the maximum thickness of slab 20mm of welding by both sides " " single V groove with root face: along with the welding thickness of slab increases, I shape groove does not just satisfy welding requirements, should adopt single V groove with root face, and for welding by both sides, maximum ga(u)ge is 36mm.”
Above-mentioned is butt weld welding procedure (containing the butt joint of T type) commonly used at present, wherein the equipment that promptly needs big elevating capacity about the requirement of " welding by both sides " could stand up the workpiece that is welded, to reach the requirement of " welding by both sides ", generally under plant-manufactured situation, still can accomplish, then can only take overhead welding (need possess personnel's welding of special welding technical ability during as sections spelling welding under the situation that does not possess tipping arrangement or at the scene, however also can there be trace " undercut " defective in overhead weld, influence serviceability), or for fear of welding in the overhead position other connected modes such as can only selecting bolt.
In addition, in the Bridge Design drawing of steel all-welded structure, generally all can require " after welding selected welding rod, solder flux and steel (mother metal) welding, the mechanical strength of its deposited metal, percentage elongation and impact flexibility etc. all should be higher than base metals " in other words promptly: the mechanical property of welding point and processing performance all should be higher than base metals.And the content of harmful element sulphur, phosphorus has certain related in the impact flexibility of steel, timeliness impact property and its chemical composition.The national standard of China's welding rod is the universal standard that is applicable to every profession and trade at present, the welding rod of some model has been stipulated the content of sulphur phosphorus, some is regulation not, the situation that its sulphur phosphorus content is higher than some steel plate (mother metal) also can appear even stipulated the welding rod of sulphur phosphorus content, at this moment weld for cut deal, if take traditional double V-groove welding by both sides technology, owing to added the higher welding base metal of sulfur-bearing phosphorus too much, can't reach the requirement of " mechanical property of welding point and processing performance all should be higher than base metals ", cause the use of can only demoting of some welded unit.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of requirement that makes mechanical property that weld seam reaches welding point and processing performance all be higher than base metals is provided, has saved the I shape or the single V groove with root face ceramic substrate single face Lincoln weld method that make the hanging device that workpiece " stands up " again.
I shape of the present invention or single V groove with root face ceramic substrate single face Lincoln weld method, it may further comprise the steps:
(1) ceramic welding backing on the pad of the bottom of two mother metals to be welded, and make gap between two mother metals of I shape interface be between two mother metals of 2-3mm or single V groove with root face the bottom directly the gap between the notch portion be 3.5-4mm;
(2) adopting automatic submerged-arc welding machine is 750～850A at current value, and voltage is 38～42V, and the welding machine speed of travel is under 18～19.5 meters/hour the operating condition, from the bottom to top in two mother metal I shape interfaces to be welded or the welding of single V groove with root face place.
The invention has the advantages that:
Adopt the welding of this technology, both can make weld seam reach the requirement of " mechanical property of welding point and processing performance all should be higher than base metals ", saved the hanging device that workpiece " is stood up " again.In addition because " single V groove with root face of narrow gap and big root face " gap value is little, both sides mother metal self add in-place heat fused, cooling, crystallization, both saved welding wire, reduced the welding level again, and reduced the distortion of welding residual stress and angularity to greatest extent, welding efficiency improves simultaneously, is labor and material saving, achieves many things at one stroke.
The specific embodiment
Describe the present invention below in conjunction with specific embodiment.
I shape of the present invention or single V groove with root face ceramic substrate single face Lincoln weld method, it may further comprise the steps: (1) is ceramic welding backing on the pad of the bottom of two mother metals to be welded, and make gap between two mother metals of I shape interface be between two mother metals of 2-3mm or single V groove with root face the bottom directly the gap between the notch portion be 3.5-4mm; (2) adopting automatic submerged-arc welding machine is 750～850A at current value, and voltage is 38～42V, and the welding machine speed of travel is under 18～19.5 meters/hour the operating condition, from the bottom to top in two mother metal I shape interfaces to be welded or the welding of single V groove with root face place.Ceramic welding backing can be buied in market.
When preferably welding at the single V groove with root face place, the magnitude of voltage that the groove place adopts between two mother metals of the current value that the groove place adopts between two mother metals of described single V groove with root face and single V groove with root face identical with the direct notch portion current value in bottom is higher than the direct notch portion magnitude of voltage in bottom.
The welding mechanism of narrow gap Lincoln weld is under the condition of narrow gap existence, increase fusion penetration and the optimization technology of burn-through not, if adopt back side ceramic welding backing, it has accepted the solder flux that bleeds from narrow gap, it participates in forming the slag come-up behind the electric arc metallurgy when arc fusion welding, has stayed groove shape, and recess space plays crucible, make melt weld metal back-welding shape, so promptly formed the pressure moulding of sealing run.
The Lincoln weld of narrow gap, under the condition that the gap exists, can increase fusion penetration and the principle of burn-through is not as follows: during Lincoln weld with the increase of electric current, because the discharge effect that the pressure of electric arc increases liquid metal in the molten bath has strengthened, electric arc gos deep into base metal, and make the fusion penetration increase that is directly proportional, because the increase of fusion penetration, electric arc slips into the molten bath deeply, the mobility of welding arc is when welding current is increased to certain numerical value, owing to " buried arc " weakens, electric current increases hot input quantity increase simultaneously, the welding wire amount of fusing into also increases considerably, when the Y type groove of I shape of taking narrow gap and big root face, it is more that the mother metal of electric arc both sides fuses into the molten bath, bigger again with the molten metal amount of the common fusion of welding wire, electric arc is difficult to discharge to the liquid metal of bottom, molten bath on the contrary like this, so the time fusion penetration no longer increase, the trend of minimizing is arranged on the contrary, can reach " not burn-through ".Simultaneously, be welded to groove part timesharing (being equivalent to original narrow gap increases), be preferably under the constant situation of the direct notch portion electric current in bottom that keeps welding Y type groove, in given voltage range, increase voltage, the length of electric arc is elongated, swing effect aggravation, the molten wide increase of weld seam, particularly, increase voltage (electric current does not raise) this moment makes more arc heat be used to heat and melt the base metals of both sides, narrow gap, and voltage can reduce the input quantity of automatic submerged-arc welding machine welding wire when raising, cause a spot of welding wire and more base metals fusion, fill up in welding region, like this when the very low steel of welding sulphur phosphorus content (as Q345qD or Q345qE), the sulphur phosphorus content was original just not high in the base metals chemical composition, and the effect that desulfurization dephosphorization arranged in the electric arc metallurgical reaction is (as adopting in the low manganese fluorine type Submerged Arc Automatic Welding Flux in the silicon, MnO wherein
2And SiO
2, CaF
2One-tenth branch play this effect fully), the resulting weld seam in welding back like this, rise comprehensive performance on inspection, test, all can accomplish the requirement of " mechanical property of welding point and processing performance all should be higher than base metals ".
Embodiment 1
Two mother metals to be welded (material is Q345qD or Q345qC), steel plate thickness 16mm, I type groove, bottom pad are gone up ceramic welding backing, and to make the gap between two mother metals of I shape interface be 2mm; Adopting automatic submerged-arc welding machine is 750A at current value, and voltage is 40V, and the welding machine speed of travel is under 19 meters/hour the operating condition, to finish welding at two mother metal I shape interfaces to be welded from the bottom to top.
Conventional detection (stretching, crooked, impact flexibility experiment) through welding point can draw the mechanical property of welding point and the conclusion that processing performance all is higher than base metals.
Embodiment 2
Go up ceramic welding backing at the bottom pad of two mother metals to be welded (material is Q345qD or Q345qC), and to make the gap between two mother metals of I shape interface be 3mm; Adopting automatic submerged-arc welding machine is 850A at current value, and voltage is 42V, and the welding machine speed of travel is under 18 meters/hour the operating condition, to finish welding at two mother metal I shape interfaces to be welded from the bottom to top.
Conventional detection (stretching, crooked, impact flexibility experiment) through welding point can draw the mechanical property of welding point and the conclusion that processing performance all is higher than base metals.
Embodiment 3
Go up ceramic welding backing at the bottom pad of two mother metals to be welded (material is Q345qD or Q345qC), and to make the gap between two mother metals of I shape interface be 2.5mm; Adopting automatic submerged-arc welding machine is 780A at current value, and voltage is 38V, and the welding machine speed of travel is under 19.5 meters/hour the operating condition, to finish welding at two mother metal I shape interfaces to be welded from the bottom to top.
Conventional detection (stretching, crooked, impact flexibility experiment) through welding point can draw the mechanical property of welding point and the conclusion that processing performance all is higher than base metals.
Embodiment 4
Go up ceramic welding backing at the bottom pad of two mother metals to be welded (material is Q345qD or Q345qC), and make between two mother metals of single V groove with root face the bottom directly the gap between the notch portion be 3.5mm; Adopting automatic submerged-arc welding machine is 800A at current value, voltage is 38V, the welding machine speed of travel is under 19.5 meters/hour the operating condition, weld at the straight groove in the bottom of two mother metal single V groove with root face to be welded place from the bottom to top, keeping current value after straight groove welding finishes is 800A, voltage is upgraded to 40V, and the welding machine speed of travel is to finish welding at the single V groove with root face place under 19.5 meters/hour the operating condition.
Conventional detection (stretching, crooked, impact flexibility experiment) through welding point can draw the mechanical property of welding point and the conclusion that processing performance all is higher than base metals.
Embodiment 5
Go up ceramic welding backing at the bottom pad of two mother metals to be welded (material is Q345qD or Q345qC), and make between two mother metals of single V groove with root face the bottom directly the gap between the notch portion be 3.8mm; Adopting automatic submerged-arc welding machine is 850A at current value, and voltage is 42V, and the welding machine speed of travel is under 18 meters/hour the operating condition, to finish welding at two mother metal single V groove with root face to be welded places from the bottom to top.
Conventional detection (stretching, crooked, impact flexibility experiment) through welding point can draw the mechanical property of welding point and the conclusion that processing performance all is higher than base metals.
Embodiment 6
Go up ceramic welding backing at the bottom pad of two mother metals to be welded (material is Q345qD or Q345qC), and make between two mother metals of single V groove with root face the bottom directly the gap between the notch portion be 4mm; Adopting automatic submerged-arc welding machine is 750A at current value, and voltage is 38V, and the welding machine speed of travel is under 19 meters/hour the operating condition, to finish welding at two mother metal single V groove with root face to be welded places from the bottom to top.
Conventional detection (stretching, crooked, impact flexibility experiment) through welding point can draw the mechanical property of welding point and the conclusion that processing performance all is higher than base metals.
Claims (2)
1.I shape or single V groove with root face ceramic substrate single face Lincoln weld method is characterized in that it may further comprise the steps:
(1) ceramic welding backing on the pad of the bottom of two mother metals to be welded, and make gap between two mother metals of I shape interface be between two mother metals of 2-3mm or single V groove with root face the bottom directly the gap between the notch portion be 3.5-4mm;
(2) adopting automatic submerged-arc welding machine is 750～850A at current value, and voltage is 38～42V, and the welding machine speed of travel is under 18～19.5 meters/hour the operating condition, from the bottom to top in two mother metal I shape interfaces to be welded or the welding of single V groove with root face place.
2. I shape according to claim 1 or single V groove with root face ceramic substrate single face Lincoln weld method, it is characterized in that: when welding at the single V groove with root face place, the magnitude of voltage that the groove place adopts between two mother metals of the current value that the groove place adopts between two mother metals of described single V groove with root face and single V groove with root face identical with the direct notch portion current value in bottom is higher than the direct notch portion magnitude of voltage in bottom.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010113237A CN101786196A (en) | 2010-02-24 | 2010-02-24 | Single-side union melt automatic welding method of ceramic backing with I-shaped joint or Y-shaped groove |
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| CN201010113237A CN101786196A (en) | 2010-02-24 | 2010-02-24 | Single-side union melt automatic welding method of ceramic backing with I-shaped joint or Y-shaped groove |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103817416A (en) * | 2014-01-27 | 2014-05-28 | 天津新港船舶重工有限责任公司 | One-step molding submerged arc welding method for steel sheet docking |
| CN108176910A (en) * | 2017-12-14 | 2018-06-19 | 中国核工业华兴建设有限公司 | A kind of nuclear power station Leak-tight liner siding band ceramic backing Lincoln weld method |
-
2010
- 2010-02-24 CN CN201010113237A patent/CN101786196A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103817416A (en) * | 2014-01-27 | 2014-05-28 | 天津新港船舶重工有限责任公司 | One-step molding submerged arc welding method for steel sheet docking |
| CN108176910A (en) * | 2017-12-14 | 2018-06-19 | 中国核工业华兴建设有限公司 | A kind of nuclear power station Leak-tight liner siding band ceramic backing Lincoln weld method |
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Open date: 20100728 |