CN1238155C

CN1238155C - Castlion electrode with low-carbon steel core wire

Info

Publication number: CN1238155C
Application number: CN 02139427
Authority: CN
Inventors: 卢光杰; 卢宏新
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-09-16
Filing date: 2002-09-16
Publication date: 2006-01-25
Anticipated expiration: 2022-09-16
Also published as: CN1483548A

Abstract

The present invention relates to a cast iron welding rod with a low-carbon steel core wire. The outer part of a low-carbon steel core wire is coated with a layer of soldering paste skin. The soldering paste skin is made by 30 to 34% of reduced iron powder, 13 to 21% of marble powder, 13 to 17% of ilmenite, 4 to 8% of ocher powder, 2 to 8% of pottery clay, 1 to 4% of potassium ferrocyanide, 3 to 7% of silver graphite, 2 to 5% of fluorescent graphite, 1 to 5% feldspar powder, 0.4 to 0.7% of Sodium carbonate, 0.3 to 0.8% of aluminium powder, 0.1 to 0.5% of zinc powder, 0.2 to 0.6% of hematite, 0.8 to 1.0% of gold powder, 0.26 to 0.8% of Sodium nitrite, 0.02 to 0.1% of titanium dioxide, 6 to 10% of water glass, and 0.02 to 2% of Sodium hydroxide according to a compounding ratio. The present invention has the advantages of simple structure, low production cost, strong crack resistance of a welding seam, good fusion of the welding seam, beautiful welding shape, etc. Raw materials can be easily obtained. After the welding, the normalizing post-metallization structure and the hardness of the performance of the welded seam are consistent. After the anneal, the hardness can be matched with cast iron. A welded joint can satisfy the requirements of the cast iron. The present invention can adapt the welding of various cast iron base materials.

Description

The low carbon steel welding core electrode for cast iron

Technical field

The invention belongs to and be used for soldering, the welding rod of welding or cutting, electrode, material, the media technology field, the composition and the character that are specifically related to material are the welding rod of characteristics.

Background technology

Various casting flaws very easily appear in ironcasting, the percent defective height, welding technological properties is poor, and plasticity is poor, very easily forms crackle under thermal stress and structural stress, after being heated, cast iron will produce cementite slightly greatly as cooling velocity, be so-called spoken parts in traditional operas, spoken parts in traditional operas district hardness is equivalent to more than 5 times of cast iron hardness up to HB800, the spoken parts in traditional operas district is not only hard but also crisp, results in welding back crackle.The content of sulphur and phosphorus is 5 times of general mild steel up to 0.2% in the chemical analysis of cast iron.When welding, behind the cast iron smelting that it is contained sulphur and phosphorus mix the welding liquation, greatly reduce the drawing crack of weld metal.

The welding rod of welding cast iron has 308 pure nickel electrodes, casting 408 alloy electrodes, 508 welding rods at present, though these welding rods can strengthen the anti-crack ability of weld seam to a certain extent, price lattice costliness makes these products extensively not promoted the use of because of disappearing.

The welding rod of other welding cast iron has hydrogen controlled electrodes such as knot 506, knot 507, knot 426, knot 427, its advantage is that production cost is low, the weld seam fusion is better, welding forming is attractive in appearance, its shortcoming is that the weld seam crack resistance is poor, and pore arranged, the hardness of weld seam is difficult to machining apparatus processing, and the sealing of weld seam is poor.

Reported a kind of low-carbon steel core welding rod of welding cast iron in welding the 9th phase of magazine " research of the general electrode for cast iron of the low chilling tendency of the high nodularization stability " literary composition, the Main Ingredients and Appearance of its weld seam is: C, Si, Mn, S, P, Er, Mg, Al, Ca and other alkaline-earth metal.This welding rod has advantages such as single cost is low, easy manufacturing, but metallographic structure and hardness are incomplete after the Weld Performance normalizing of welding back, hardness after the annealing can not be complementary with cast iron QT60-2, QT50-5, QT42-10 respectively, and welding point can not satisfy the requirement of cast iron QT70-2.

Summary of the invention

Technical problem to be solved by this invention and to solve the technical scheme that its technical problem adopts be to connect one deck welding agent skin in the low carbon steel welding core outsourcing, welding agent skin of the present invention is made by following weight percentages and proportioning thereof:

Reduced iron powder 30～34%

Marble powder 13～21%

Ilmenite 13～17%

Ochre powder 4～8%

Potter's clay 2～8%

Potassium ferrocyanide 1～4%

Silver graphite 3～7%

Fluorite China ink 2～5%

Feldspar powder 1～5%

Sodium carbonate 0.4～0.7%

Aluminium powder 0.3～0.8%

Zinc powder 0.1～0.5%

Bloodstone 0.2～0.6%

Copper bronze 0.8～1.0%

Natrium nitrosum 0.26～0.8%

Titanium dioxide 0.02～0.1%

Waterglass 6～10%

NaOH 0.02～2%.

The preferred weight proportioning of welding agent skin of the present invention is:

Reduced iron powder 31～33%

Marble powder 15～20%

Ilmenite 14～16%

Ochre powder 5～7%

Potter's clay 3～6%

Potassium ferrocyanide 1～3%

Silver graphite 4～6%

Fluorite China ink 3～5%

Feldspar powder 2～4%

Sodium carbonate 0.5～0.7%

Aluminium powder 0.4～0.8%

Zinc powder 0.2～0.4%

Bloodstone 0.3～0.5%

Copper bronze 0.8～1.0%

Natrium nitrosum 0.4～0.7%

Titanium dioxide 0.03～0.08%

Waterglass 6～9%

NaOH 0.02～1.5%.

The optimum weight proportioning of welding agent skin of the present invention is:

Reduced iron powder 32%

Marble powder 17%

Ilmenite 15%

Ochre powder 6%

Potter's clay 5%

Potassium ferrocyanide 2%

Silver graphite 5%

Fluorite China ink 4%

Feldspar powder 3%

Sodium carbonate 0.6%

Aluminium powder 0.6%

Zinc powder 0.3%

Bloodstone 0.4%

Copper bronze 1%

Natrium nitrosum 0.55%

Titanium dioxide 0.05%

Waterglass 7%

NaOH 0.5%.

Mild steel of the present invention is H08 or H08A mild steel.

Its preparation technology is as follows:

1, core wire preparation

The dish circle process of rolling of H08 or H08A mild steel is peeled off, and pickling is dialled and is changeed, and alignment is cut off stand-by.

2, the welding agent leather is equipped with

Bulk material in the raw material proportioning is ground into 40～80 order powder, and diffluent NaOH carried out purification process, prepare burden by percentage by weight of the present invention then, except that waterglass and other raw material at first mix, stir with mixer, it is fully mixed, adding waterglass at last stirs with mixer, press group when stirring to a small amount of bulk of appearance, with electrode extrusion press core wire is carried out dusting again, respectively dried 1 hour at 40 ℃, 80 ℃, 120 ℃, 200 ℃, be cooled to normal temperature at 200 ℃ of slow plain silk fabrics.

3, test by quality control standards (QCS) of the present invention after, packing warehouse-in.

The present invention compares with the electrode for cast iron that oneself has, ordinary low-carbon steel core wire and pure iron core wire have been adopted, be coated with the weldering skin outward, have advantages such as simple in structure, that raw material are easy to get, production cost is low, the anti-crack ability of weld seam strong, the weld seam fusion is better, welding forming is attractive in appearance, metallographic structure and hardness are consistent after the Weld Performance normalizing of welding back, hardness after the annealing can be complementary with cast iron, and welding point can satisfy the requirement of cast iron, can adapt to the welding of multiple cast iron mother metal.

The specific embodiment

The present invention is described in more detail below in conjunction with embodiment, but the invention is not restricted to these embodiment.

Embodiment 1

With production product 333kg of the present invention, required welding agent skin 100kg is example, and raw material that the welding agent skin is used and proportioning thereof are:

Reduced iron powder 32kg

Marble powder 17kg

Ilmenite 15kg

Ochre powder 6kg

Potter's clay 5kg

Potassium ferrocyanide 2kg

Silver graphite 5kg

Fluorite China ink 4kg

Feldspar powder 3kg

Sodium carbonate 0.6kg

Aluminium powder 0.6kg

Zinc powder 0.3kg

Bloodstone 0.4kg

Copper bronze 1kg

Natrium nitrosum 0.55kg

Titanium dioxide 0.05kg

Waterglass 7kg

NaOH 0.5kg.

Its preparation technology is as follows:

1, core wire preparation

2, the welding agent leather is equipped with

Embodiment 2

Reduced iron powder 30kg

Marble powder 20kg

Ilmenite 13kg

Ochre powder 4kg

Potter's clay 7.4kg

Potassium ferrocyanide 1kg

Silver graphite 6.5kg

Fluorite China ink 2kg

Feldspar powder 4.5kg

Sodium carbonate 0.4kg

Aluminium powder 0.8kg

Zinc powder 0.1kg

Bloodstone 0.6kg

Copper bronze 0.8kg

Natrium nitrosum 0.8kg

Titanium dioxide 0.1kg

Waterglass 6kg

NaOH 2kg.

The preparation technology of its preparation technology and embodiment 1 is identical

Embodiment 3

Reduced iron powder 34kg

Marble powder 13kg

Ilmenite 17kg

Ochre powder 8kg

Potter's clay 2kg

Potassium ferrocyanide 4kg

Silver graphite 3kg

Fluorite China ink 5kg

Feldspar powder 1kg

Sodium carbonate 0.7kg

Aluminium powder 0.3kg

Zinc powder 0.5kg

Bloodstone 0.2kg

Copper bronze 1kg

Natrium nitrosum 0.26kg

Titanium dioxide 0.02kg

Waterglass 10kg

NaOH 0.02kg.

The preparation technology of its preparation technology and embodiment 1 is identical.

Also can design the low carbon steel welding core electrode for cast iron of another concrete structure according to above-mentioned principle.

Claims

1, a kind of low carbon steel welding core electrode for cast iron connects one deck welding agent skin in the low carbon steel welding core outsourcing, it is characterized in that described welding agent skin made by following weight percentages and proportioning thereof:

Reduced iron powder 30～34%

Marble powder 13～21%

Ilmenite 13～17%

Ochre powder 4～8%

Potter's clay 2～8%

Potassium ferrocyanide 1～4%

Silver graphite 3～7%

Fluorite China ink 2～5%

Feldspar powder 1～5%

Sodium carbonate 0.4～0.7%

Aluminium powder 0.3～0.8%

Zinc powder 0.1～0.5%

Bloodstone 0.2～0.6%

Copper bronze 0.8～1.0%

Natrium nitrosum 0.26～0.8%

Titanium dioxide 0.02～0.1%

Waterglass 6～10%

NaOH 0.02～2%.

2, according to the described low carbon steel welding core electrode for cast iron of claim 1, wherein the weight proportion of each raw material is:

Reduced iron 31～33%

Marble powder 15～20%

Ilmenite 14～16%

Ochre powder 5～7%

Potter's clay 3～6%

Potassium ferrocyanide 1～3%

Silver graphite 4～6%

Fluorite China ink 3～5%

Feldspar powder 2～4%

Sodium carbonate 0.5～0.7%

Aluminium powder 0.4～0.8%

Zinc powder 0.2～0.4%

Bloodstone 0.3～0.5%

Copper bronze 0.8～1.0%

Natrium nitrosum 0.4～0.7%

Titanium dioxide 0.03～0.08%

Waterglass 6～9%

NaOH 0.02～1.5%.

3, according to the described low carbon steel welding core electrode for cast iron of claim 1, wherein the weight proportion of each raw material is:

Reduced iron powder 32%

Marble powder 17%

Ilmenite 15%

Ochre powder 6%

Potter's clay 5%

Potassium ferrocyanide 2%

Silver graphite 5%

Fluorite China ink 4%

Feldspar powder 3%

Sodium carbonate 0.6%

Aluminium powder 0.6%

Zinc powder 0.3%

Bloodstone 0.4%

Copper bronze 1%

Natrium nitrosum 0.55%

Titanium dioxide 0.05%

Waterglass 7%

NaOH 0.5%.

4, according to the described low carbon steel welding core electrode for cast iron of claim 1, it is characterized in that: said mild steel is H08 or H08A mild steel.