CN110434425B - Surfacing welding method for fuel injection area of cylinder head of S60MC diesel engine - Google Patents
Surfacing welding method for fuel injection area of cylinder head of S60MC diesel engine Download PDFInfo
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- CN110434425B CN110434425B CN201910585846.9A CN201910585846A CN110434425B CN 110434425 B CN110434425 B CN 110434425B CN 201910585846 A CN201910585846 A CN 201910585846A CN 110434425 B CN110434425 B CN 110434425B
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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
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
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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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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- Arc Welding In General (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention relates to a surfacing welding method for a fuel injection area of a cylinder head of an S60MC diesel engine, wherein the fuel injection area of the cylinder head of the S60MC diesel engine is heated to 300 ℃ in a high-temperature furnace before being welded; s60MC taking out the fuel injection area of the cylinder cover of the diesel engine from the high-temperature furnace and then performing supplementary heating by using a computer temperature control instrument heater; s60MC heating the fuel injection area of the cylinder head of the diesel engine to 310 ℃ at 290-; welding the fuel injection area: the welding adopts pulse gas shielded welding or manual argon tungsten-arc welding. The invention provides a surfacing welding method for a fuel injection area of an S60MC diesel engine cylinder cover, which ensures that the quality of a welding seam meets requirements, thereby obtaining a reasonable welding process for product production and ensuring the product quality.
Description
Technical Field
The invention relates to the technical field of ship production, in particular to a surfacing welding method for a fuel injection area of an S60MC diesel engine cylinder cover.
Background
The S20CrMoVs chromium-nickel-iron alloy is the main material of the S60ME-C8.2 cylinder cover of the marine diesel engine. S60ME-C8.2 cylinder cover, the inner chamber combustion chamber has two parts which need to be processed after the overlaying welding of the alloy material of the corrosion-resistant and heat-resistant layer, and the overlaying welding technology difficulty coefficient of the alloy material of the corrosion-resistant and heat-resistant layer is higher.
According to a product drawing designed by MANB & W diesel engine company, a high-temperature-resistant and corrosion-resistant nickel-chromium alloy (Inconel 625) is subjected to surfacing welding at a cylinder cover oil injection hole of a large-cylinder-diameter diesel engine S60MC, the cylinder cover body is made of an S17MoS forged piece, the thickness of the cylinder cover body is 492mm, the diameter of the cylinder cover body is 1097mm, and 6mm (the processed size) of the Inconel 625 corrosion-resistant material is subjected to surfacing welding at two sides. The quality requirement of the cylinder cover with the chromium-nickel-iron coating is high and precise, so that the method is very important for the reliable operation of a main engine. Therefore, MAN company requires that before manufacturers of inconel clad cylinder heads permit suppliers to produce this type of cylinder heads, their welding capabilities must be demonstrated to meet MAN company-related quality control document requirements and approvals: 1, MDT is qualified; 2. the chemical composition proportion of the metal Fe and the metal Si of the overlaying layer is required to meet the requirements of MAN0742804-4.12 specifications; 3. the surfacing layer can meet the requirements of high temperature resistance and corrosion resistance; the specification is 0743172-1.4, which can be approved as an approved supplier of inconel cylinder head coating cylinder heads. In order to form domestic medium and low speed diesel engine supporting bases, surfacing research on corrosion-resistant and heat-resistant alloy materials of the cylinder cover is required, and the S60ME-C8.2 cylinder cover and the cylinder cover with a larger cylinder diameter can be developed vigorously.
Disclosure of Invention
In order to solve the technical problems, the invention provides a surfacing method for a fuel injection area of a cylinder cover of an S60MC diesel engine, which is used for knowing whether the content of iron element, the hardness of a surfacing layer and the metallographic structure meet the design requirements of a product in the fusion process of metal through a dilution test, a hardness test and a metallographic test on a welding test block, and ensuring that the quality of a welding seam meets the requirements through nondestructive inspection (ultrasonic flaw detection UT and dye flaw detection PT) on the welding seam, thereby obtaining a reasonable welding process for product production and ensuring the quality of the product.
The technical scheme of the invention is as follows:
a fuel injection area overlaying method for a cylinder head of an S60MC diesel engine comprises the following steps:
s1: before welding a fuel injection area of a cylinder head of the diesel engine of S60MC, heating the cylinder head in a high-temperature furnace to 300 ℃;
s2: s60MC taking out the fuel injection area of the cylinder cover of the diesel engine from the high-temperature furnace and then performing supplementary heating by using a computer temperature control instrument heater;
s3: s60MC heating the fuel injection area of the cylinder head of the diesel engine to 310 ℃ at 290-;
s4: welding the fuel injection area: the welding adopts pulse gas shielded welding or manual tungsten argon arc welding;
and finishing the surfacing welding of the fuel injection area of the cylinder head of the diesel engine S60 MC.
Preferably, the step S1: the fuel injection area of the diesel engine cylinder head of the S60MC is made of S20CrMoVs, and the welding wire material adopted in the method belongs to Inconel 625 class.
Preferably, the step S2: the supplementary heating method is to heat up to 145-155 ℃ at a heating rate of 40-60 ℃ per hour.
Preferably, the step S4: the gas adopted by the pulse gas shielded welding is a mixed gas of Ar and He according to a volume ratio of 85:15, the gas flow is 12-18L/min, and the number of welding layers is more than or equal to 2.
Further preferably, the gas used for the pulse gas shielded welding is a mixed gas of Ar and He in a volume ratio of 85: 15.
Preferably, the conditions of the pulse gas shielded welding in step S4 are as follows: the welding current is 160-220A; the arc voltage is 26-32V; the welding speed is 20-35 cm/min; the gas flow is 15-20L/min; the interchannel temperature was: the first layer is less than or equal to 300 ℃, and the second layer and the third layer are less than or equal to 200 ℃.
Preferably, the conditions of the pulse gas shielded welding in the step S4 are specifically shown in table 1:
TABLE 1
Preferably, the manual argon tungsten-arc welding process conditions in the step S4 are as follows: the welding current is 100-180A; the welding speed is 10-16 cm/min; the gas flow is 12-18L/min; the interchannel temperature was: the first layer is less than or equal to 300 ℃, the second layer and the third layer are less than or equal to 200 ℃, and Ar used in the manual argon tungsten-arc welding is more than or equal to 99.99 percent.
Preferably, the manual argon tungsten-arc welding conditions in the step S4 are specifically shown in table 2:
TABLE 2
The invention has the following beneficial effects:
1. using 80-90Ar 12-18He gas, requiring pulse welding, wherein the minimum welding layer number is 2 layers, and ensuring that the Fe element content of a machining surface with the final machining surface being at least below 2mm is less than or equal to 10 percent; the thickness of the chromium-nickel-iron alloy is more than or equal to 3 mm; the maximum hardness of the heat reaction zone is less than or equal to 450 HV.
2. The requirements on the chemical components of the surfacing layer, particularly the control of Fe element, perfects and optimizes the practical, reasonable, operable and economical S20CrMoVs chromium-nickel-iron alloy surfacing process, and meets the requirements on welding quality and efficiency;
3. firstly, a test piece is placed in a high-temperature furnace for heating, so that the test piece is preheated according to the heating rate of 40-60 ℃/h required by a specification, and the test piece can be completely preheated, thereby reducing the stress of steel; after the test piece is taken out of the high-temperature furnace, the intelligent temperature controller is connected to ensure that the preheating temperature of the test piece is more than or equal to 150 ℃, because the test piece is rapidly cooled to be below 150 ℃ after being taken out of the furnace, in order to improve the welding performance of the material, the preheating temperature of the test piece is more than or equal to 150 ℃; the reason that the intelligent temperature controller cannot be directly used for heating the temperature to 300 ℃ is that the intelligent temperature controller directly raises the temperature at once, the temperature rise rate is too fast to control, nickel is most easily affected by sulfur, phosphorus, lead, tin and zinc at high temperature, however, any element forming eutectic with low melting point is harmful, even if in a small amount, and embrittlement causes stress cracks from a welding seam to a heat affected zone.
4. According to the principle of equal-strength matching of welding materials and base materials, the Inconel 625 type welding materials are selected for the S20CrMoVs base materials, so that the welding performance of the materials is better, and excellent welding seam deposited metal is obtained.
5. The step S2: the supplementary heating method is to heat up to 145-155 ℃ at a heating rate of 40-60 ℃ per hour. The test plate is ensured to obtain effective preheating temperature, the inside of the test plate is effectively preheated, the test plate is enabled to achieve the integral preheating effect, the cleanliness of the welding surface is ensured, the stress of steel is reduced, convenient conditions are provided for subsequent welding, and the mechanical property of the welding seam is enabled to be qualified.
6. The step S4: the gas adopted by the pulse gas shielded welding is a mixed gas of Ar and He according to a volume ratio of 85:15, the gas flow is 15-20L/min, and the number of welding layers is more than or equal to 2. The gas proportion is proper, a welding pool can be effectively protected, the metal fusion transition of a welding line is ensured to be good, and the defects of unfused, slag inclusion, pores and the like are eliminated, so that a qualified welding line is formed, and good mechanical properties are ensured.
7. The conditions of the pulse gas shielded welding in the step S4 are as follows: the welding current is 160-220A; the arc voltage is 26-32V; the welding speed is 20-35 cm/min; the gas flow is 15-20L/min; the interchannel temperature was: the first layer is less than or equal to 300 ℃, and the second layer and the third layer are less than or equal to 200 ℃. Reasonable welding process parameters, effective preparation before welding and correct inter-channel cleaning method are necessary conditions for ensuring that qualified welding seams are obtained.
Drawings
FIG. 1 is a schematic view of a surfacing welding area of a corrosion-resistant and heat-resistant layer of a cylinder cover according to the present invention;
FIG. 2S 20CrMoVS Inconel furnace integral preheating schematic diagram;
FIG. 3 is a schematic view of the auxiliary heating of the intelligent temperature controller for the S20CrMoVS CrNiFeNi alloy test plate;
FIG. 4 is a schematic diagram of the welding process operation: wherein FIG. 4a is GMAW-P welded, FIG. 4b is GTAW welded;
FIG. 5 is a distribution diagram of the test plate weld bead and weld layer;
FIG. 6 is a schematic view of UT flaw detection operations;
FIG. 7 is a schematic view of a PT inspection operation;
FIG. 8 is a schematic view of a lateral bend test;
FIG. 9 micro-metallographic phase of pulsed gas-shielded welding (GMAW-P);
FIG. 10 microscopic metallographic phase of manual argon tungsten arc welding (GTAW);
Detailed Description
The invention is further illustrated by the following examples, but the scope of the invention as claimed is not limited to the scope of the examples.
TABLE 3 Cylinder head build-up welding steel plate chemical element requirement
Example 1
A fuel injection area overlaying method for a cylinder head of an S60MC diesel engine comprises the following steps:
s1: before welding a fuel injection area of a cylinder head of the diesel engine of S60MC, heating the cylinder head in a high-temperature furnace to 300 ℃;
s2: s60MC taking out the fuel injection area of the cylinder cover of the diesel engine from the high-temperature furnace and then performing supplementary heating by using a computer temperature control instrument heater;
s3: s60MC heating the fuel injection area of the cylinder head of the diesel engine to 310 ℃ at 290-;
s4: welding the fuel injection area: the welding adopts pulse gas shielded welding or manual tungsten argon arc welding;
and finishing the surfacing of the fuel injection area of the cylinder head of the diesel engine S60 MC.
Preferably, the step S1: the fuel injection area of the diesel engine cylinder head of the S60MC is made of S20CrMoVs, and the welding wire material adopted in the method belongs to Inconel 625 class.
Preferably, the step S2: the supplementary heating method is to heat up to 145-155 ℃ at a heating rate of 40-60 ℃ per hour.
Preferably, the step S4: the gas adopted by the pulse gas shielded welding is a mixed gas of Ar and He according to the volume ratio of 85:15, the gas flow is 15-20L/min, and the number of welding layers is more than or equal to 2.
Preferably, the conditions of the pulse gas shielded welding in step S4 are as follows: the welding current is 160-220A; the arc voltage is 26-32V; the welding speed is 20-35 cm/min; the gas flow is 15-20L/min; the interchannel temperature was: the first layer is less than or equal to 300 ℃, and the second layer and the third layer are less than or equal to 200 ℃.
Preferably, the conditions of the pulse gas shielded welding in the step S4 are specifically shown in table 4:
TABLE 4
The chemical elements of the pulse gas shielded welding surfacing test plate surfacing steel plate are shown in a table 5:
TABLE 5
| Sample number | Si | Fe | Cr | Ni | Mo |
| 2018-114-1 | 0.10 | 1.21 | 21.37 | 64.0 | 9.13 |
| 2018-114-2 | 0.10 | 6.32 | 20.48 | 60.6 | 8.52 |
| 2018-114-3 | 0.10 | 5.13 | 20.95 | 61.1 | 8.64 |
| 2018-114-4-1 | 0.11 | 14.50 | 19.03 | 55.0 | 7.72 |
| 2018-114-4-2 | 0.11 | 15.46 | 18.67 | 54.5 | 7.63 |
| 2018-114-4-3 | 0.11 | 17.55 | 18.21 | 53.3 | 7.43 |
| 2018-114-5 | 0.29 | Base | 1.02 | 0.20 | 0.44 |
| 2018-114-6 | 0.20 | Base | 0.95 | 0.07 | 0.40 |
Macroscopic metallographic phase:
after 2 processed samples are polished on a sample grinding machine, corrosion is carried out according to requirements, and defects such as cracks, air holes, incomplete fusion, incomplete penetration and the like are not found, as shown in figure 9.
Hardness of
TABLE 6
| Position of | Base material | Maximum hardness of heat affected zone | Width of heat affected zone | Welding material |
| Hardness HV10 | 221 | 292 | 3.0mm | 260 |
As can be seen from tables 3-4, the chemical composition analysis and the hardness test of the test pieces which are made of S20CrMoVs and subjected to the surfacing welding by adopting 85% Ar + 15% He pulse gas shielded welding all the data meet the requirements of MAN0742804-4.12 specification, so that the process is qualified and can be applied to actual production.
Example 2
A fuel injection area overlaying method for a cylinder head of an S60MC diesel engine comprises the following steps:
s1: before welding a fuel injection area of a cylinder head of the diesel engine of S60MC, heating the cylinder head in a high-temperature furnace to 300 ℃;
s2: s60MC taking out the fuel injection area of the cylinder cover of the diesel engine from the high-temperature furnace and then performing supplementary heating by using a computer temperature control instrument heater;
s3: s60MC heating the fuel injection area of the cylinder head of the diesel engine to 310 ℃ at 290-;
s4: welding the fuel injection area: the welding adopts pulse gas shielded welding or manual tungsten argon arc welding;
and finishing the surfacing welding of the fuel injection area of the cylinder head of the diesel engine S60 MC.
Preferably, the step S1: the fuel injection area of the diesel engine cylinder head of the S60MC is made of S20CrMoVs, and the welding wire material adopted in the method belongs to Inconel 625 class.
Preferably, the step S2: the supplementary heating method is to heat up to 145-155 ℃ at a heating rate of 40-60 ℃ per hour.
Preferably, the manual argon tungsten-arc welding process conditions in the step S4 are as follows: the welding current is 100-180A; the welding speed is 10-16 cm/min; the gas flow is 12-18L/min; the interchannel temperature was: the first layer is less than or equal to 300 ℃, and the second layer and the third layer are less than or equal to 200 ℃.
Preferably, the manual argon tungsten-arc welding conditions in the step S4 are specifically shown in table 7:
TABLE 7
The analysis result of the chemical components of the manual argon tungsten-arc welding test plate is as follows:
TABLE 8
Macroscopic metallographic phase:
after 2 processed samples are polished on a sample grinding machine, corrosion is carried out according to requirements, and defects such as cracks, air holes, incomplete fusion, incomplete penetration and the like are not found, as shown in figure 10.
Hardness of
TABLE 9
As can be seen from tables 8-9, the test pieces made of S20CrMoVs and subjected to surfacing welding by using 99.99% Ar manual argon tungsten arc welding meet the requirements of MAN0742804-4.12 specification through chemical composition analysis and hardness tests, so that the process is qualified and can be applied to actual production.
Claims (3)
1. A fuel injection area overlaying method for a cylinder head of an S60MC diesel engine is characterized by comprising the following steps:
s1: before welding a fuel injection area of a cylinder head of the diesel engine S60MC, heating the fuel injection area in a high-temperature furnace to 300 ℃, wherein the fuel injection area of the cylinder head of the diesel engine S60MC is made of S20CrMoVs, and a welding wire material adopted in the method belongs to Inconel 625 class;
s2: s60MC taking out the fuel injection area of the cylinder head of the diesel engine from the high-temperature furnace and then performing supplementary heating by using a computer temperature controller heater, wherein the supplementary heating method is that the temperature is increased to 145-155 ℃ at the temperature increase rate of 40-60 ℃ per hour;
s3: s60MC heating the fuel injection area of the cylinder head of the diesel engine to 310 ℃ at 290-;
s4: welding a fuel injection area: the welding adopts pulse gas shielded welding or manual tungsten argon arc welding;
completing surfacing of a fuel injection area of the diesel engine cylinder head S60 MC;
the step S4: the gas adopted by the pulse gas shielded welding is a mixed gas of Ar and He according to a volume ratio of 85:15, the gas flow is 15-20L/min, and the number of welding layers is more than or equal to 2; the conditions of the pulse gas shielded welding are as follows: the welding current is 160-220A; the arc voltage is 26-32V; the welding speed is 20-35 cm/min; the gas flow is 15-20L/min; the interchannel temperature was: the first layer is less than or equal to 300 ℃, and the second layer and the third layer are less than or equal to 200 ℃;
the manual argon tungsten-arc welding process conditions are as follows: the welding current is 100-180A; the welding speed is 10-16 cm/min; the gas flow is 12-18L/min; the interchannel temperature was: the first layer is less than or equal to 300 ℃, the second layer and the third layer are less than or equal to 200 ℃, and Ar used in the manual argon tungsten-arc welding is more than or equal to 99.99%.
2. The method of claim 1, wherein the conditions of the step S4 pulse gas shielded welding are specified in table 1:
TABLE 1
3. The method of claim 1, wherein the manual argon tungsten-arc welding conditions of step S4 are specifically shown in table 2:
TABLE 2
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- 2019-07-01 CN CN201910585846.9A patent/CN110434425B/en active Active
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