CN1188033A - Small diameter electric welding rod for middle or small bore pipeline backing weld - Google Patents
Small diameter electric welding rod for middle or small bore pipeline backing weld Download PDFInfo
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- CN1188033A CN1188033A CN97108810A CN97108810A CN1188033A CN 1188033 A CN1188033 A CN 1188033A CN 97108810 A CN97108810 A CN 97108810A CN 97108810 A CN97108810 A CN 97108810A CN 1188033 A CN1188033 A CN 1188033A
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Abstract
The present invention uses a low-hydrogen type coated welding electrode whose core diameter is 1.6-2.0 mm to make backing weld for welding middle and small bore steel tube. The core diameter of said electrode is small, so that its electric current only is 30-55A, input line capacity is small, electric arc power is small, molten pool volume is small, liquid metal and slag can be clearly separated, therefore it is easy to be mastered by welder, and can easily obtain high-quality backing weld.
Description
The invention belongs to a kind of in, small-bore pipeline backing welding small diameter electric welding rod
In traditional pipeline welding technology, the effective diameter of large-diameter steel is the welding that feels secure of Φ 2.5～Φ 4mm welding rod, and when Φ 32～Φ 325mm steel pipe welds, because used welding rod diameter is thicker during welding, the molten bath volume is big, and the welder is difficult for grasping, and causes the overlap of weld seam back easily, burn, defective such as lack of penetration and pore, can't guarantee welding quality.Therefore, all specify the employing argon arc welding to feel secure in present most of construction technology rules.Feel secure with argon arc welding, the above-mentioned defective that is easy to generate in the time of can avoiding arc welding, but there is argon gas supply inconvenience, need to be equipped with welding machine special, welding cost costliness is when constructing in the open air, wind loading rating is poor, and impure or when moisture is arranged when argon gas, be easy to generate pore, very easily produce defectives such as tungsten inclusion during misoperation.
Purpose of the present invention is to provide a kind of small diameter electric welding rod, is used for small-bore pipeline bottoming welding.
Small diameter pipeline uranami welding electrode of the present invention, its coating basic recipe is: CaCO
3+ MgCO
3, 28～48%, metal fluoride 12～25%, the total 4～10% of one or two or more kinds in quartz, white clay, mica and the sepiolite, ZrO
2Or zircon sand 0.5～7%, C0.1～0.5%, deoxidiers 15～20% such as Fe-Si, Fe-Mn, Fe-Ti, the oxide 0.5～5% of Fe and Mn, other is a plasticizer.The manufacturing of small diameter pipeline uranami welding electrode can adopt common welding rod manufacturing process to make, and also is about to the coating that above-mentioned prescription is formed, and makes the bonding agent extrusion on mild steel (or low-alloy steel) core wire with waterglass, thereby makes the pipeline uranami welding electrode.When needs soldering low alloy high-strength steel or heat resisting steel steel pipe, also need in coating, to add Fe-Mo, Fe-V, little carbon Fe-Cr or Ni powder in right amount according to by the requirement of weldering Metal Mechanic Property and chemical composition.In order to improve the deposition efficiency of welding rod, also can in prescription, add and be no more than 35% reduced iron powder.
It is Φ 1.6, Φ 1.8 or Φ 2.0mm hydrogen controlled covering welding rod that the present invention adopts diameter, in carrying out, the bottoming of small-caliber steel pipe welding.Because core diameter is little, used electric current only is 30～55 amperes, and the input heat input is little, and arc power is little, and the molten bath volume is little, and it is clear that liquid metals separates with slag, makes the very easy grasp of welder, obtains high-quality backing run easily.
Small diameter pipeline uranami welding electrode of the present invention, coating slag system are CaO-CaF
2-T
1O
2-S
1O
2Slag system, owing to add the capillary material of a certain amount of minimizing slag in the prescription, improved the wellability of high-temperature slag and liquid metals, overcome common low-hydrogen electrode weld shape projection when the groove bottom welds, made welding bead both sides slag inclusion, clear up clean, the big shortcoming of polishing workload, welding bead is smooth, or it is slightly recessed, the removability of slag is good, can reduce welder's scarfing cinder, polishing workload, and construction cost is less than 1/3rd of argon arc welding.
The main effect and the limitation reason of each component is summarized as follows in the prescription:
CaCO
3, MgCO
3Belong to carbonate, under the high arc temperature effect, can decomposite CO
2Gas, the protection arc atmosphere is not subjected to O in the atmosphere
2, N
2Intrusion, and can reduce H in the arc column
2Dividing potential drop, reduce the content of diffusible hydrogen in the deposited metal.In addition, its catabolite CaO, MgO are the strong basicity oxides, can guarantee that slag has certain basicity, to guarantee weld metal high toughness are arranged.When carbonate content is lower than 28%, the protective gas deficiency, weld seam is easy to generate the root pore, also can make removability of slag variation, and diffusible hydrogen content increases in the weld seam, causes delayed crack easily.When content surpassed 48%, the coating fusing point was too high, and sleeve is long, is unfavorable for that the welder operates, and the arc oxidation enhancing, makes the increase of splashing.Simultaneously, viscosity coefficient of dross and surface tension are excessive, make slag spreadability variation, and weld seam easily becomes convex, and the both sides scarfing cinder is difficult for, and increase the polishing workload.Metal fluoride can adopt CaF
2, MgF
2Or Na
2SiF
6In one or more, fluoride has strong dehydrogenation effect, and can regulate the viscosity and the surface tension of slag.When content of fluoride was lower than 12%, viscosity coefficient of dross was too high, and mobile poor, the welding bead ripple is thick, and the diffusible hydrogen content height.When content of fluoride surpassed 25%, the coating fusing point was low excessively, and length sleeve is short, and during little electric current welding, electrode tip clings with the molten bath liquid metals easily, and influence is operated.And viscosity coefficient of dross is too small, and slag drops down under easily during the pipe backing welding.
Quartz, white clay, synthetic mica and sepiolite all belong to alumino-silicate, mainly be to be used for regulating viscosity coefficient of dross, improve appearance of weld, and white clay and sepiolite have certain viscosity, synthetic mica is the sheet elastic material, the flowability of coating in the time of can improving the welding rod extrusion, but addition can not be excessive, otherwise make slag acidity excessive, influence the appearance of weld and the removability of slag.
ZrO
2Reach zircon sand and help the droplet transfer, regulate the viscosity coefficient of dross and the removability of slag of improving in the groove, but addition is too many, welding seam toughness is descended.
C can scale graphite, amorphous graphite or add the oxide of iron or manganese reaction in C and the coating, generation CO and CO with cast iron powder or high-carbbon iron alloy (as height, mid-carbon fe-mn etc.) form
2, in the welding rod sleeve, produce force of explosion, increase blow force of arc, make the molten drop refinement.But the addition of C is wanted strict control, is no more than 0.10% with C content in the control weld seam and is advisable, otherwise can make weld metal intensity too high, worsens toughness and plasticity.
The oxide of iron or manganese is with Fe
2O
3, Fe
3O
4Or MnO
2Form adds, and the surface tension that is mainly used to regulate slag is improved the wellability of slag to liquid metals, reduces the convexity of weld seam in the groove.When addition surpassed 5%, it was serious to make in the weld metal Si, Mn etc. contain the gold element scaling loss on the one hand, makes removability of slag variation on the other hand.
Fe-Si, Fe-Mn, Fe-Ti add as deoxidier, simultaneously, contain a certain amount of Mn, Si in the weld metal, can make weld metal obtain certain mechanical property, for tensile strength is the E5015 type welding rod of 500MPa, and the appropriate level in the weld metal is Mn～1%, Si～0.4%.When requiring weld metal to have higher intensity, can corresponding raising Mn, Si content, also can in coating, add alloys such as an amount of Fe-Mo, Fe-V and little carbon Fe-Cr, Ni powder simultaneously, to obtain the chemical composition and the mechanical property of low-alloy high-strength steel or heat resisting steel corresponding requirements.
Electrode coating type of the present invention is a low hydrogen type, has both guaranteed that weld metal had enough toughness, again can be from core wire or by the electrode coating various gold elements that contain that smoothly transit, thus can make such pipeline back cover welding rod can develop into series of products, that is:
1) C-Mn of steel pipes such as welding 20g, Q235, X42 is the carbon steel uranami welding electrode;
2) contain alloying elements such as Cr, Ni, Mo, be used to weld the low-alloy high-strength steel pipeline uranami welding electrode of steel pipes such as X60～X80;
3) contain Mo or Cr-Mo alloying element, be used to weld the pipeline uranami welding electrode of heat resisting steel such as 15CrMo, 12Cr1MoV;
4) contain alloying elements such as Cr or Cr-Ni, be used to weld OCr18Ni9 (304), 1Cr18Ni9Ti stainless pipeline uranami welding electrodes such as (321).
Small diameter pipeline uranami welding electrode compositions of surfacing metal embodiment of the present invention (%) lists in table 1.Proposition replaces traditional argon arc welding bottoming technology with Φ 1.6～Φ 2.0 minor diameter low hydrogen type pipeline uranami welding electrodes, is used for Φ 32～Φ 325mm, small-bore pipeline backing welding.
Claims (6)
1, in a kind of, the small-bore pipeline uranami welding electrode, it is characterized in that its diameter is Φ 1.6～Φ 2.0mm.
2, pipeline uranami welding electrode according to claim 1 is characterized in that coating is made the bonding agent extrusion on mild steel (or low-alloy steel) core wire with waterglass, promptly constitutes the pipeline uranami welding electrode.
3, pipeline uranami welding electrode according to claim 1 is characterized in that the coating basic recipe is: CaCO
3+ MgCO
3, 28～48%, metal fluoride 12～25%, the total 4～10% of one or two or more kinds in quartz, white clay, mica and the sepiolite, ZrO
2Or zircon sand 0.5～7%, C0.1～0.5%, deoxidiers 15～20% such as Fe-Si, Fe-Mn, Fe-Ti, the oxide 0.5～5% of Fe and/or Mn, other is a plasticizer.
4, pipeline uranami welding electrode according to claim 1 is characterized in that being used to weld C-Mn is carbon steel pipes with low-carbon steel core, hydrogen controlled covering
5, pipeline uranami welding electrode according to claim 1 is characterized in that by coating transition portion alloying element, being used for the soldering low alloy high strength steel pipe with mild steel or low-alloy steel core.
6,, it is characterized in that being used to weld heat resisting pipe with mild steel or chrome molybdenum steel core according to claims 1 described pipeline uranami welding electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97108810A CN1188033A (en) | 1997-01-15 | 1997-01-15 | Small diameter electric welding rod for middle or small bore pipeline backing weld |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97108810A CN1188033A (en) | 1997-01-15 | 1997-01-15 | Small diameter electric welding rod for middle or small bore pipeline backing weld |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1188033A true CN1188033A (en) | 1998-07-22 |
Family
ID=5170658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97108810A Pending CN1188033A (en) | 1997-01-15 | 1997-01-15 | Small diameter electric welding rod for middle or small bore pipeline backing weld |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1188033A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104889607A (en) * | 2015-06-15 | 2015-09-09 | 赵兰 | Copper clad welding rod and manufacturing method thereof |
| CN117484006A (en) * | 2024-01-02 | 2024-02-02 | 天津市金桥焊材集团股份有限公司 | Modified titanium-calcium type coated surfacing welding electrode and preparation method thereof |
-
1997
- 1997-01-15 CN CN97108810A patent/CN1188033A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104889607A (en) * | 2015-06-15 | 2015-09-09 | 赵兰 | Copper clad welding rod and manufacturing method thereof |
| CN117484006A (en) * | 2024-01-02 | 2024-02-02 | 天津市金桥焊材集团股份有限公司 | Modified titanium-calcium type coated surfacing welding electrode and preparation method thereof |
| CN117484006B (en) * | 2024-01-02 | 2024-03-19 | 天津市金桥焊材集团股份有限公司 | Modified titanium-calcium type coated surfacing welding electrode and preparation method thereof |
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| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |