CN109454349A - A kind of heat treatment method reducing steel-casting machined surface weld hardness - Google Patents
A kind of heat treatment method reducing steel-casting machined surface weld hardness Download PDFInfo
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- CN109454349A CN109454349A CN201811407154.7A CN201811407154A CN109454349A CN 109454349 A CN109454349 A CN 109454349A CN 201811407154 A CN201811407154 A CN 201811407154A CN 109454349 A CN109454349 A CN 109454349A
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- Prior art keywords
- welding
- remelting
- hardness
- heat treatment
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/003—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to controlling of welding distortion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a kind of heat treatment methods for reducing steel-casting machined surface weld hardness, selection is filled repair welding to workpiece pit with argon arc welding filler wire first, repair welding is required according to interlayer temperature control in technological parameter at 270-350 DEG C, welding current control is 150-180A, the Ar gas that GTAW protective gas is 99.999%, flow is 10-18L/min execution, the welding number of plies is layer 2-4, it is walked using straight weldering, it is layered shunting repair welding, after flushing, remove weld reinforcement, after the completion of step 1, side continues one layer of TIG remelting layer of more welderings in welded joints, using identical technological parameter, then remelting heat treatment is carried out, wherein melting current is 180A, voltage is 17V, remelting is walked using straight weldering, the width of remelting welding bead is no more than 7mm.Cap bead Technology For Remelting of the present invention is not necessarily to extras, and easy to operate, the hardness for reducing weld seam is obvious, and product is indeformable after processing does not aoxidize, and low energy consumption, improves production efficiency, effectively prevents dimensional discrepancy caused by intensely processed products vacuum heat treatment.
Description
Technical field
The present invention relates to post weld heat treatment fields, and in particular to heat treatment mode reduces B50A178H and adds after a kind of novel welding
The new method of work face weld hardness.
Background technique
There is the unacceptable small defect such as sand holes stomata crackle and is lacked by eliminating in finishing stage in B50A178H casting
After falling into simultaneously repair welding, the reduction of hardness can be realized by temper bead/ annealing bead technology or overall vacuum heat treatment.
The temper bead/ annealing bead technology of the prior art reduces hardness, and technology complicated difficult is to grasp and reduce stiffening effect shakiness
It is fixed.Overall vacuum Equipment for Heating Processing is very expensive, and equipment has the limitation of size, while time consumption and energy consumption to product.Vacuum
When heat treatment, product experience high-temperature heat treatment has the risk of size distortion, is not suitable for high-precision product machined surface repair welding hardness
Reduction.Vacuum heat treatment is due to that can not accomplish absolute vacuum, and surface has slight oxidation to product during heat treatment, institute
To influence surface brightness.Technical operation is simple through the invention, is easily mastered, and reduction stiffening effect is obvious, and equipment is simple, by
In only needing to handle at repair welding, so product size is also unrestricted on other machined surfaces or non-processing face without influence.
Summary of the invention
The technical problem to be solved by the present invention for the above-mentioned state of the art is to provide a kind of reduction steel-casting machined surfaces
The heat treatment method of weld hardness.
The technical scheme of the invention to solve the technical problem is:
A kind of heat treatment method reducing steel-casting machined surface weld hardness, includes the following steps:
Step 1: selection is filled repair welding to the workpiece pit after eliminating defect with argon arc welding filler wire ER90S-B3,
Repair welding requires according to interlayer temperature control in technological parameter welding current control 150-180A, the GTAW protection at 270-350 DEG C
The Ar gas that gas is 99.999%, flow are 10-18L/min execution, and the TIG argon arc welding welding number of plies is layer 2-4, and use is straight
Weldering walking, is layered shunting repair welding, after repair welding to after flushing with casting, polishes or removes weld reinforcement using milling machine, using hard
It spends measuring instrument and measures production joint position hardness；
Step 2: after the completion of step 1, side continues one layer of TIG remelting layer of more welderings in welded joints, equally uses ER90S-B3
Welding wire, according to interlayer temperature control in technological parameter at 270-350 DEG C, welding current control 150-180A, GTAW are protected for welding
The Ar gas that gas is 99.999% is protected, then flow 10-18L/min utilizes the argon arc welding method counterweight melting welding layer that do not fill silk
Remelting heat treatment is carried out, wherein melting current is 180A, and voltage 17V, remelting is using straight weldering walking, the width of remelting welding bead
No more than 7mm, after cast product is cooling, polishing is carried out to weld reinforcement or milling machine milling removes, is measured and is produced using qualimeter
Product position while welding hardness；
Step 3: the hardness number of the poor weld of the materials such as low-alloy steel carbon steel casting and forging products machined surface is carried out
Comparison.
Beneficial effects of the present invention: using argon arc welding cap bead Technology For Remelting of the present invention, is not necessarily to extras, operation letter
Just, the hardness for reducing weld seam is obvious, and product is indeformable after processing does not aoxidize, and low energy consumption, improves production efficiency, effectively prevents essence
Dimensional discrepancy caused by converted products vacuum heat treatment.
Specific embodiment
Present invention is further described in detail combined with specific embodiments below.
A kind of heat treatment method reducing steel-casting machined surface weld hardness, includes the following steps:
Step 1: selection is filled repair welding to the workpiece pit after eliminating defect with argon arc welding filler wire ER90S-B3,
Repair welding requires according to interlayer temperature control in technological parameter welding current control 150-180A, the GTAW protection at 270-350 DEG C
The Ar gas that gas is 99.999%, flow are 10-18L/min execution, and the TIG argon arc welding welding number of plies is layer 2-4, and use is straight
Weldering walking, is layered shunting repair welding, after repair welding to after flushing with casting, polishes or removes weld reinforcement using milling machine, using hard
It spends measuring instrument and measures production joint position hardness；
Step 2: after the completion of step 1, side continues one layer of TIG remelting layer of more welderings in welded joints, equally uses ER90S-B3
Welding wire, according to interlayer temperature control in technological parameter at 270-350 DEG C, welding current control 150-180A, GTAW are protected for welding
The Ar gas that gas is 99.999% is protected, then flow 10-18L/min utilizes the argon arc welding method counterweight melting welding layer that do not fill silk
Remelting heat treatment is carried out, wherein melting current is 180A, and voltage 17V, remelting is using straight weldering walking, the width of remelting welding bead
No more than 7mm, after cast product is cooling, polishing is carried out to weld reinforcement or milling machine milling removes, is measured and is produced using qualimeter
Product position while welding hardness；
Step 3: the hardness number of the poor weld of the materials such as low-alloy steel carbon steel casting and forging products machined surface is carried out
Comparison.
B50A178H casting (C content 0.15-0.20, Mn content≤0.90, Si content≤0.80, Cr content of the present invention
2.00-2.75, Mo content 0.90-1.20, P content≤0.025, S content≤0.015, Cu content≤0.35, Ni content≤
0.50, W content≤0.10, V content≤0.05, Sn content≤0.025, As content≤0.015, Sb content≤0.0035, Ti contains
Amount≤0.060, Al content≤0.025.) its medium casting mechanical properties tensile strength be 585-760MPa casting hardness requirement≤
Hardness requirement≤280HB of 241HB weld seam.In finishing stage, machined surface finds that sand holes stomata slag etc. is unacceptable small scarce
It falls into, with polishing, excavates, the methods of cutting removal processing planar defect forms the pit of lower diagram form.The polishing of its pits is round and smooth,
Through PT detection pit surface without linear and NONLINEAR DEFECT, pit depth is no more than 5mm.
When implementation, using argon arc welding filler wire ER90S-B3, welding wire is that uncle closes Co., Ltd TGT in happy welding technique
CrMo, specification 2.4mm*1000mm, lot number 8825325 content C0.11, Si0.61, Mn0.93, P0.010, S0.002,
Cr2.53, Mo0.95, Cu0.06, Ni0.04 are filled repair welding to the pit after elimination defect, and repair welding is required according to technique
Card, wherein at 270-350 DEG C, welding current control 150-180A, GTAW protective gas is 99.999% for interlayer temperature control
Ar gas, flow 10-18L/min) execute.The TIG argon arc welding welding number of plies is layer 2-4, is walked using straight weldering, layering point
Road repair welding.After repair welding to after being flushed with casting, polishes or remove weld reinforcement using milling machine, use qualimeter (model
TL100 Leeb Hardness Tester) measurement production joint position hardness (3 point hardnesses of measurement, respectively A1, A2, A3, wherein 3 points
It on same straight line, and is uniformly distributed)；
Side continues one layer of TIG remelting layer of more welderings in welded joints, equally uses ER90S-B3 welding wire, and welding meets Welder
Skill card, wherein interlayer temperature control are in 270-350 DEG C, welding current control 150-180A, GTAW protective gas
99.999% Ar gas, flow 10-18L/min, it is desirable that and then the argon arc welding method counterweight melting welding layer that do not fill silk carries out remelting
Heat treatment, wherein melting current be 180A, voltage 17V, remelting using straight weldering walking, the not super 7mm of the width of remelting welding bead,
Specific process parameter is shown in Table 1.After cast product is cooling, polish weld reinforcement (layer i.e. after the remelting of remelting layer)
Or milling machine milling removes, using qualimeter measurement production joint position hardness (3 point hardnesses of measurement, respectively B1, B2,
B3, wherein 3 points are located along the same line and are uniformly distributed) design parameter is shown in Table 2.
Table 1
Table 2
| Before remelting | A1 | A2 | A3 | Average value | It is required that≤280HB |
| Machined surface weld hardness | 296HB | 286HB | 307HB | 296HB | It does not meet |
| After remelting | B1 | B2 | B3 | Average value | It is required that≤280HB |
| Machined surface weld hardness | 272HB | 258HB | 268HB | 266HB | Meet |
Above content is only citing made for the present invention and explanation, affiliated those skilled in the art are to being retouched
The specific embodiment stated does various modifications or additions or is substituted in a similar manner, as long as it does not deviate from the concept of invention
Or beyond the scope defined by this claim, it is within the scope of protection of the invention.
Claims (1)
1. a kind of heat treatment method for reducing steel-casting machined surface weld hardness, which comprises the steps of:
Step 1: selection is filled repair welding, repair welding to the workpiece pit after eliminating defect with argon arc welding filler wire ER90S-B3
It is required that according in technological parameter, interlayer temperature control is at 270-350 DEG C, welding current control 150-180A, GTAW protective gas
For 99.999% Ar gas, flow is 10-18L/min execution, and the TIG argon arc welding welding number of plies is layer 2-4, is gone using straight weldering
It walks, is layered shunting repair welding, after repair welding to after being flushed with casting, polish or remove weld reinforcement using milling machine, surveyed using hardness
It measures instrument and measures production joint position hardness；
Step 2: after the completion of step 1, side continues one layer of TIG remelting layer of more welderings in welded joints, equally uses ER90S-B3 welding wire,
According in technological parameter, interlayer temperature control is at 270-350 DEG C for welding, welding current control 150-180A, GTAW protective gas
For 99.999% Ar gas, then flow 10-18L/min carries out weight using the argon arc welding method counterweight melting welding layer that do not fill silk
Molten heat treatment, wherein melting current is 180A, voltage 17V, and remelting is no more than using straight weldering walking, the width of remelting welding bead
7mm carries out polishing to weld reinforcement or milling machine milling removes, measure production joint using qualimeter after cast product is cooling
Position hardness；
Step 3: the hardness number of the poor weld of the materials such as low-alloy steel carbon steel casting and forging products machined surface is compared.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811407154.7A CN109454349A (en) | 2018-11-23 | 2018-11-23 | A kind of heat treatment method reducing steel-casting machined surface weld hardness |
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| CN201811407154.7A CN109454349A (en) | 2018-11-23 | 2018-11-23 | A kind of heat treatment method reducing steel-casting machined surface weld hardness |
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| CN109454349A true CN109454349A (en) | 2019-03-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113500270A (en) * | 2021-06-30 | 2021-10-15 | 共享铸钢有限公司 | Welding method for surface defects of steel castings |
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| JPS61170577A (en) * | 1985-01-22 | 1986-08-01 | Toyota Motor Corp | Formation of alloyed layer on al alloy casting surface |
| CN86101207A (en) * | 1986-02-26 | 1987-09-09 | 重庆大学 | New method of amending surface defects of castings |
| CN102151960A (en) * | 2010-12-31 | 2011-08-17 | 陕西国德电气制造有限公司 | Automatic TIG (Tungsten Inert Gas) remelting forming method of weld joints in aluminum alloy shell |
| EP2695694A1 (en) * | 2012-07-13 | 2014-02-12 | Energoinstal S.A. | Method of welding of elements for the power industry, particulary of sealed wall panels of power boilers using MIG/MAG and laser welding |
| JP2014083565A (en) * | 2012-10-23 | 2014-05-12 | Honda Motor Co Ltd | Method of manufacturing tailored blank, and tailored blank |
| CN105855663A (en) * | 2016-05-05 | 2016-08-17 | 李炳涛 | New method for surfacing coating composite welding |
| CN106041265A (en) * | 2016-06-07 | 2016-10-26 | 西安向阳航天材料股份有限公司 | Welding method for controlling hardness of welding affected zone of low alloy steel for petroleum pipeline |
| CN107378287A (en) * | 2017-06-23 | 2017-11-24 | 江阴中绿冶金设备有限公司 | The method that built-up welding remelting is combined repair welding roller surface defect |
| CN108817610A (en) * | 2018-09-07 | 2018-11-16 | 中国能源建设集团安徽电力建设第工程有限公司 | A kind of 12Cr1MoVG path Thick Wall Tube Welding method |
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2018
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Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3192079A (en) * | 1961-12-30 | 1965-06-29 | Shin Mitsubishi Jukogyo Kk | Arc welding method |
| JPS61170577A (en) * | 1985-01-22 | 1986-08-01 | Toyota Motor Corp | Formation of alloyed layer on al alloy casting surface |
| CN86101207A (en) * | 1986-02-26 | 1987-09-09 | 重庆大学 | New method of amending surface defects of castings |
| CN102151960A (en) * | 2010-12-31 | 2011-08-17 | 陕西国德电气制造有限公司 | Automatic TIG (Tungsten Inert Gas) remelting forming method of weld joints in aluminum alloy shell |
| EP2695694A1 (en) * | 2012-07-13 | 2014-02-12 | Energoinstal S.A. | Method of welding of elements for the power industry, particulary of sealed wall panels of power boilers using MIG/MAG and laser welding |
| JP2014083565A (en) * | 2012-10-23 | 2014-05-12 | Honda Motor Co Ltd | Method of manufacturing tailored blank, and tailored blank |
| CN105855663A (en) * | 2016-05-05 | 2016-08-17 | 李炳涛 | New method for surfacing coating composite welding |
| CN106041265A (en) * | 2016-06-07 | 2016-10-26 | 西安向阳航天材料股份有限公司 | Welding method for controlling hardness of welding affected zone of low alloy steel for petroleum pipeline |
| CN107378287A (en) * | 2017-06-23 | 2017-11-24 | 江阴中绿冶金设备有限公司 | The method that built-up welding remelting is combined repair welding roller surface defect |
| CN108817610A (en) * | 2018-09-07 | 2018-11-16 | 中国能源建设集团安徽电力建设第工程有限公司 | A kind of 12Cr1MoVG path Thick Wall Tube Welding method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113500270A (en) * | 2021-06-30 | 2021-10-15 | 共享铸钢有限公司 | Welding method for surface defects of steel castings |
| CN113500270B (en) * | 2021-06-30 | 2023-03-07 | 共享铸钢有限公司 | Welding method for surface defects of steel castings |
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Application publication date: 20190312 |