CN103495813A

CN103495813A - Alloy powder for CO2 gas shielded welding powder overlaying

Info

Publication number: CN103495813A
Application number: CN201310421966.8A
Authority: CN
Inventors: 张元彬; 罗辉; 霍玉双; 刘鹏
Original assignee: Shandong Jianzhu University
Current assignee: Shandong Jianzhu University
Priority date: 2013-09-07
Filing date: 2013-09-07
Publication date: 2014-01-08
Anticipated expiration: 2033-09-07
Also published as: CN103495813B

Abstract

The invention provides alloy powder for CO2 gas shielded welding powder overlaying, and belongs to the technical field of material surface wear-proof overlaying. The alloy powder is mainly composed of 15-25% of ferrotitanium, 15-20% of vanadium powder, 5-10% of molybdenum powder, 35-50% of chromium powder, 5-8% of ferroboron and 4-10% of graphite. After the surface of a workpiece is precoated by the powder, CO2 gas shielded welding is utilized for overlaying, welding wires are made of H08Mn2Si with the diameter of 1.0mm, a welding current ranges from 120A to160A, an arc voltage ranges from 18V to 25V, the welding speed ranges from 15 meters per hour to 20 meters per hour, and gas flow ranges from 10 liters per minute to 15 liters per minute. CO2 powder overlaying has the small dilution rate, the high deposition rate and the good overlaying layer performance, the surface hardness reaches HRC50-55, and the alloy powder is mainly used for surface wear-proof overlaying of steel parts.

Description

For CO 2the alloy powder of gas shielded arc welding powder weld deposition

Technical field:

The invention belongs to the hardfacing technical field, provide a kind of for CO ₂the alloy powder of gas shielded arc welding powder weld deposition, for the hard-facing of steel parts.

Background technology

High speed development along with modern industrial technology, component of machine is often worked under very complicated and exacting terms, increasing plant equipment is scrapped because of wearing and tearing, corrosion or abrasion, and this just requires at HTHP, bear mechanized equipment surface under the conditions of work such as larger load and oxidation, corrosion has the good performance such as wear-resisting, corrosion-resistant, high temperature resistant and anti-oxidant.And built-up welding is applied in the manufacture and reparation of each industrial department part more and more widely as one of important channel of improving the machinery part surface performance.

Built-up welding is that the alloy material with certain serviceability is deposited over to the surface of fertile material by certain thermal source means, to give the special serviceability of mother metal or to make part recover the process of original geomery.Therefore built-up welding can be used for the failure site that repair materials causes because of military service; also can be for the surface of strengthening material or part; to reasonable use material, improve product design, reduce production costs, realize repairing the old and utilizing scraps; and economize on resources, the energy, protection of the environment is all significant.

Overlaying method has SMAW built-up welding, submerged arc overlay welding, plasma arc powder built-up welding, gas shielded arc welding built-up welding, ESW etc., and resurfacing welding material comprises welding rod, welding wire, built-up welding powder etc.Wherein applying alloy powder refers to the alloying element of needs is mixed with to the alloy powder with certain particle size in proportion, it is coated in to surface of the work, after being fused with mother metal under the thermal source condition, it just forms the deposited metal of alloying, the ratio modulation of its alloying component is convenient, needn't pass through rolling, hot candied supervisor, the alloying component loss is little.

CO ₂powder weld deposition is a kind of advanced person's bead-welding technology.It is that the alloy powder that is applied in advance surface of the work is utilized to CO ₂arc-melting, built-up welding form overlay cladding.Compare CO with other arc welding method ₂the weldering welding productivity is high, welding cost is low, the welding energy consumption is low, applied widely and CO ₂weldering is a kind of low hydrogen type or ultralow hydrogen type welding method, and the weld seam hydrogen content is low, cracking resistance good.CO ₂powder weld deposition has the dilution of little mother metal, higher deposition rate and good overlay properties, at present mainly for the manufacture of new parts with repair two aspects of old part.

Summary of the invention

The invention provides a kind of for CO ₂the alloy powder of gas shielded arc welding powder weld deposition, for carrying out CO at the steel component surface ₂the powder hardfacing, improve its surface abrasion resistance.

Described alloy powder, chief component is: ferrotianium, vanadium powder, molybdenum powder, chromium powder, ferro-boron, graphite etc. mix, and then add binding agent to be applied in advance surface of the work, stand-by after drying.The mass percent that it is characterized in that each constituent of alloy powder is: ferrotianium (15～25) %, vanadium powder (15～20) %, molybdenum powder (5～10) %, chromium powder (35～50) %, ferro-boron (5～8) %, graphite (4～10) %.

The raw-material granularities such as described ferrotianium, vanadium powder, molybdenum powder, chromium powder, ferro-boron, graphite are 40～200 orders, and each raw material main component (mass percent) is:

Ferrotianium: Ti > 30%; Ferro-boron: B (15～17) %, C<1.0%.

Binding agent adopts waterglass.

CO ₂the powder weld deposition technical process:

(1) take in proportion each powder raw material and mix, then adding binding agent to stir, making wet-milling.

(2) wet-milling be applied to through removing surface, the surface of the work derusted and flatten coating layer thickness 1.0～1.5mm.

(3) the wet-milling precoated shet is dried through room temperature more than 10 hours, then dry 2 hours for 110～180 ℃.

(4) utilize CO ₂gas shielded arc welding carries out powder weld deposition, and welding wire is selected the H08Mn2Si of φ 1.0mm, welding current 120～160A, arc voltage 18～25V, speed of welding 15～20mh ^-1, gas flow 10～15Lmin ^-1.

(5) after built-up welding one deck, carry out removing surface; Repeat said process according to specific requirement and carry out multiple-bead deposit, meet the requirements of overlay cladding thickness, last grinding is to needed accessory size.

Adopt the powder weld deposition method, the effect of powder mainly contains three aspects:: the one, and powder absorbs arc energy, reduces the fusing of surface of the work mother metal, has reduced the dilution rate of overlay cladding; The 2nd, powder smelting forms deposited metal, improves the built-up welding deposition efficiency; The 3rd, alloy powder plays the alloy transition effect, alloy powder contains carbide former Ti, V, Mo, Cr and ferro-boron, graphite, alloying element enters molten pool metal, can form the ceramic phases such as carbide, boride, in addition, Ti is for deoxidation, and Ti, V, Mo element have remarkable result for refinement deposited metal tissue.Deposited metal fine microstructures after built-up welding, hardness can reach HRC50～55, has higher wearability.

The specific embodiment

Require to buy the raw material such as ferrotianium, vanadium powder, molybdenum powder, chromium powder, ferro-boron, graphite according to granularity and composition, according to design proportion (mass percent) alloyage powder and mix: ferrotianium (15～25) %, vanadium powder (15～20) %, molybdenum powder (5～10) %, chromium powder (35～50) %, ferro-boron (5～8) %, graphite (4～10) %.In alloy powder, add binding agent to stir, make wet-milling; Wet-milling be applied in advance to the surface of the work derusted through removing surface and flatten, dry through room temperature more than 10 hours, then drying 2 hours for 110～180 ℃.Utilize CO ₂gas shielded arc welding carries out powder weld deposition, at surface of the work, forms overlay cladding.Welding wire is selected the H08Mn2Si of φ 1.0mm, welding current 120～160A, arc voltage 18～25V, speed of welding 15～20mh ^-1, gas flow 10～15Lmin ^-1.

Example one

For CO ₂the alloy powder of gas shielded arc welding powder weld deposition, the mass percent of each constituent is: ferrotianium 25%, vanadium powder 16%, molybdenum powder 6%, chromium powder 40%, ferro-boron 5%, graphite 8%.

The alloyage powder also mixes, and adds suitable quantity of water glass to make binding agent, stirs, and makes wet-milling; Wet-milling is applied in advance to the Q235B surface of low-carbon steel derusted through removing surface and flattens, and the about 1mm of coating layer thickness, dry through 24 hours room temperatures, then dries 2 hours for 150 ℃.Select semi-automatic NBC-250 type CO ₂the gas shield welding machine, welding wire is selected the H08Mn2Si of φ 1.0mm, welding current 150A, arc voltage 20～22V, speed of welding 18mh ^-1, gas flow 15Lmin ^-1.Built-up welding is two-layer, the about HRC52 of deposited metal case hardness.

Claims

1. for CO ₂the alloy powder of gas shielded arc welding powder weld deposition; it is characterized in that powder constituent (mass percent) is: ferrotianium (15～25) %; vanadium powder (15～20) %; molybdenum powder (5～10) %; chromium powder (35～50) %; ferro-boron (5～8) %, graphite (4～10) %.

2. alloy powder according to claim 1, the granularity of each powder raw material is 40～200 orders, raw material main component: ferrotianium: Ti > 30%; Ferro-boron: B (15～17) %, C<1.0%, binding agent adopts waterglass.

3. alloy powder according to claim 1, it is for CO ₂the technical process of powder weld deposition:

(1) take in proportion each powder raw material and mix, then adding binding agent to stir, making wet-milling;

(2) wet-milling be applied to through removing surface, the surface of the work derusted and flatten coating layer thickness 1.0～1.5mm;

(3) the wet-milling precoated shet is dried through room temperature more than 10 hours, then dry 2 hours for 110～180 ℃;

(4) utilize CO ₂gas shielded arc welding carries out powder weld deposition, and welding wire is selected the H08Mn2Si of φ 1.0mm, welding current 120～160A, arc voltage 18～25V, speed of welding 15～20mh ^-1, gas flow 10～15Lmin ^-1;