CN1103614A - Ceramic flux for build-up welding - Google Patents

Abstract

The ceramic flux is suitable for automatic submerged-arc surfacing welding of cold-rolling roller. It has the chemical components by weight of: CaCo3 40-45%, CaF2 10-15%, Al2O3 5-10%, TiO2 15-18%, K2CO3 1-3%, Ti-Fe 2-5%, Mo-Fe 1-2% and W-Fe 1-3%. In conjunction with 50 CrV welding wire, surfacing layer with very high normal-temp. hardness and wear resistance may be obtained.

Description

Ceramic flux for build-up welding

The invention belongs to welding material, be applicable to that mainly repairing material is GC _rThe automatic submerged-arc bead welding of 15 welded tube cold roll.

Roll is the crucial spare part of valuable and easy consumption during steel rolling is produced, and the quality of roll quality directly influences product quality, and the technique for overlaying of hot roll is maturation, uses wider.But the built-up welding reparation of cold roll is not used both at home and abroad as yet, and the material of welded tube cold roll is generally GC now _r15, because GC _r15 phosphorus content and alloying element are more, a series of weld defects such as cracking very easily appear during built-up welding, postwelding also cannot say for sure to demonstrate,prove performance requirements such as its high rigidity and high-wearing feature, so most of Welded Pipe Plant are promptly scrapped because of the rolling face wearing and tearing are overproof, perhaps the roller radius car with overproof is little, the working face that utilizes again car to go out.But the problem that the turning reparation exists is: because turning reduces the roll external diameter, the speed between roller and the roller is not matched, cause to twist off power transmission shaft or damage by the tube rolling surface; Rolling face hardness descends after the turning, and the life-span is low; And can not adopt the turning reparation greater than 2mm or the serious roll of concentrated wear to wear extent.Therefore, Welded Pipe Plant generally all does to scrap processing to the roll of wearing and tearing.

The purpose of this invention is to provide a kind of material that is applicable to is GC _r15 cold roll ceramic flux for build-up welding DG10, this bonded flux and 50C _rV welding wire coupling is carried out automatic submerged-arc bead welding, and the gained surfacing layer metal has very high normal temperature hardness (more than the HRC57) and higher wearability, with the GC of this bonded flux built-up welding reparation _r15 cold rolls have characteristics such as steady quality, case hardness height.

At above-mentioned purpose, the chemical composition (percentage by weight) of the bonded flux DG10 of research and design of the present invention is: C _aCO ₃40～45%, C _aF ₂10～15%, Al ₂O ₃5～10%, TiO ₂15～18%, K ₂W ₃L～3%, Ti-F _e2～5%, C _r-F _e8～10%, M _o-F _e1～3%, W-F _e1～3%.

The content of element (percentage by weight) is as follows in the above-mentioned ferroalloy: Ti-F _eMiddle Ti content is 25～30%, C _r-F _eMiddle C _rContent is 50～55%, M _o-F _eMiddle M _oContent is 30～35%, W-F _eMiddle W content is 32～34%.

In this bonded flux DG10, added ferroalloys such as ferrotianium, ferrochrome, ferromanganese and ferrotungsten, made and contain a certain amount of T in the surfacing layer metal ₁, C _r, M _o, intensified elements such as W, postwelding make and separate out the reinforcement hard points such as molybdenum carbide tungsten carbide that uniform disperse distributes in the surfacing layer metal through heat treatment, have improved its normal temperature hardness and wearability.

Production technology of the present invention is as follows: by prescription chemical composition scope batching, after fully mixing, it is even to do the binding agent damping with waterglass, carries out the granulation drying and packaging then on comminutor.

Adopt bonded flux DG10 of the present invention and 50C _rThis coupling of V is to being carried out the automatic submerged-arc built-up welding by the weldering cold roll, postwelding welds cold roll to quilt for 400 ℃ in furnace temperature and carries out 1 hour 30 minutes temper, and with the stove silk ribbon attached to an official seal or a medal cold after, can obtain the overlay cladding of Rockwell hardness HRC60～64, the selection of material is YW2 again, B parameter is-13 °, and a is that 9 ° lathe tool carries out turning processing, and can get the roll working surface is the welded tube cold roll of HRC57～59.

According to chemical analysis scope of the present invention, be mixed with bonded flux DG10, its concrete chemical analysis sees Table 1.Cooperate 50C with solder flux DG10 _rThe V welding wire is to GC _r15 welded tube cold rolls carry out actual built-up welding, have tested built-up welding working face performance after the built-up welding.GC _r15 tempering are learned composition and are seen Table 2,50C _rV welding wire chemical analysis sees Table 3, the chemical analysis of overlay cladding and case hardness such as table 4, and shown in the table 5, overlay cladding and GC _r15 wearability contrast sees Table 6.

The chemical analysis (weight %) of table 1 embodiment bonded flux DG10

Table 2 GC _r15 steel chemical compositions (weight %)

Steel grade

C

Si

m n

C r

Ni

S

P

GYC r

0.95-1.05

0.15-0.35

0.20-0.40

1.30-1.45

≤0.30

≤0.02

≤0.02

The used welding wire 50C of table 3 embodiment _rThe chemical analysis of V (weight %)

Table 4 embodiment overlay cladding chemical analysis (weight %)

Annotate: gage of wire φ 1.6mm

Claims (2)

1, a kind of ceramic flux for build-up welding is characterized in that chemical analysis (weight %) is: CaCO ₃40～45%, CaF ₂10～15%, Al ₂O ₃5～10%, TiO ₂15～18%, K ₂CO ₃1～3%, Ti-Fe2～5%, Mo-Fe1～3%, W-Fe1～3%.

2, ceramic flux for build-up welding according to claim 1 is characterized in that Ti-F _eMiddle Ti content is 25～30%, C _r-F _eMiddle C _rContent is 50～55%, M _o-F _eMiddle M _oContent is 30～35%, W-F _eMiddle W content is 32～34%.