CN107322141A

CN107322141A - A kind of welding repair method of crank axle for vessel local defect

Info

Publication number: CN107322141A
Application number: CN201710514576.3A
Authority: CN
Inventors: 张亮; 吕文超; 柳毅君; 吴兴祥
Original assignee: SHANGHAI HULIN HEAVY INDUSTRY Co Ltd; Hudong Heavy Machinery Co Ltd
Current assignee: SHANGHAI HULIN HEAVY INDUSTRY Co Ltd; Hudong Heavy Machinery Co Ltd
Priority date: 2017-06-29
Filing date: 2017-06-29
Publication date: 2017-11-07

Abstract

A kind of welding repair method of crank axle for vessel local defect, the material of the bent axle is S34MnV, it is characterized in that, without weld preheating, but the local defect of the crankshaft surface is repaired by cold welding method, the welding repair method includes, and the defect to the crankshaft surface carries out grinding process before welding, prime coat is formed using argon arc welding again, then using CO₂Gas shielded arc welding is filled the welding of capping layer, finally carries out reconditioning polishing to repairing surface.Present invention, avoiding the cumbersome technique of weld preheating, postweld heat preservation slow cooling, reduce and reprocess cost, have the advantages that technique is simple, workable, operating efficiency is high simultaneously, available for the repairing and maintenance of the local defect of crank axle for vessel, with very high practicality.

Description

A kind of welding repair method of crank axle for vessel local defect

Technical field

The present invention relates to the renovation technique of marine diesel part, and in particular to a kind of welding of crank axle for vessel local defect Restorative procedure, belongs to welding technology field.

Background technology

Bent axle mainly carries power transmission as the core component of engine, is important in engine operation process One of moving parts.In high-power marine low-speed diesel engine, crank axle for vessel is large-scale processing forging, and size is big, quality is big, has Length reach more than ten meters, quality tons up to a hundred, cost accounts for 20% or so of diesel engine totle drilling cost.Crank axle for vessel is in transport, peace During dress occasional occur it is local damage and the defect such as wear and tear, due to high costs, once generation problems, typically to song Axle takes local route repair treatment measures.Traditional restorative procedure mainly uses supersonic spray coating, i.e., in metal surface using spraying Mode accumulate layer of metal powder so that reach repair surface damage purpose.But supersonic spray coating is to equipment, product surface The requirement of state is higher, while it is also high to reprocess cost, is unfavorable for increasing economic efficiency.Also a kind of restorative procedure of crank axle for vessel Be exactly to use welding method, but generally require progress weld preheating and postweld heat preservation slow cooling, thus efficiency is low, operation difficulty compared with Greatly.Therefore, it is just significant using more simple effective method for the local route repair of impaired bent axle.

The content of the invention

It is an object of the present invention to be repaiied in view of the shortcomings of the prior art there is provided a kind of welding of crank axle for vessel local defect Compound method, it is to avoid the preheating in repair process, carries out REPAIR WELDING, so as to reach using cold welding method to the local defect of crank axle for vessel Cost is reprocessed to saving, improves and reprocesses efficiency, the effect of guarantee product quality.

In order to realize the above object the technical scheme that the present invention is provided is as follows：

A kind of welding repair method of crank axle for vessel local defect, the material of the bent axle is S34MnV, it is characterised in that no Weld preheating is carried out, but the local defect of the crankshaft surface is repaired by cold welding method, the welding repair method Including the defect to the crankshaft surface carries out grinding process before welding, then forms prime coat using argon arc welding, then uses CO₂Gas shielded arc welding is filled the welding of capping layer, finally carries out reconditioning polishing to repairing surface.

Further, the described defect progress grinding process before welding to the crankshaft surface refers to, to the song The surface of the local defect progress reconditioning processing on axle surface, formation welding groove, the groove and the bent axle is in 50~60 degree Angle, makes welding position rounding off, and carry out cleaning treatment to the region in the range of 50mm around welding position.

Further, described use argon arc welding forms prime coat and referred to, using a diameter of 2.0 millimeters of pure nickel argon arc welding GTN-Ni1 welding wires carry out bottoming welding by argon tungsten-arc welding, and its welding condition is as follows：Welding current is 150~200A, Arc length is 1~3mm；Using purity >=99.99% of argon gas, gas flow is 10~12L/min；Welding gun is put in crescent Dynamic, amplitude of fluctuation is 1~2mm；The thickness of the prime coat of formation is 2~3mm；The GTN-Ni1 welding wires meet AWS A5.14 ERNi-1 standards.

Further, described use CO₂The welding that gas shielded arc welding is filled capping layer refers to, using a diameter of 1.2mm GFL-71Ni welding wires pass through CO₂Gas shielded arc welding carries out welding filling capping layer, and its welding condition is as follows：Weldering Electric current is connect for 180~220A, weldingvoltage is 25~28V；Using CO₂Purity >=99.98% of gas, gas flow be 15~ 25L/min；Welding gun is swung in crescent, and amplitude of fluctuation is 1~2mm, and dry extension of electrode degree is 15-25mm, and welding is until fill up The upper surface of the groove and filling capping layer is higher by 1~2mm of mother metal surface；The GFL-71Ni welding wires meet AWS A5.20 E71T-1 standards.

Further, it is described to refer to that welding terminates latter 24 hours, to welding position to repairing surface progress reconditioning polishing Carry out MT magnetic powder inspections, it is qualified after to welding position carry out reconditioning polishing.

Compared with prior art, the present invention carries out reparation welding using cold welding method, it is to avoid weld preheating, postweld heat preservation delay Cold cumbersome technique, reduces and reprocesses cost, while having the advantages that technique is simple, workable, operating efficiency is high, can use In the repairing and maintenance of the local defect of crank axle for vessel, with very high practicality.

Brief description of the drawings

Fig. 1 repairs the view before welding for the present invention.

Welding bead arrangement schematic diagram after Fig. 2 repairs for the present invention.

Embodiment

Come to make further detailed to automatic soldering technique method of the present invention with specific embodiment below in conjunction with the accompanying drawings Illustrate, but can not be limited the scope of the invention with this.

The invention provides a kind of local defect welding repair method of S34MnV materials bent axle, marine diesel can be applied to The reparation of machine crankshaft local defect, it uses cold welding method to be welded, it is to avoid the problem of weld preheating, with efficiency high, behaviour Make the features such as simple, process is easily achieved.

The material of crank axle for vessel involved in the present invention is S34MnV, and its chemical composition is shown in Table 1：

The S34MnV chemical compositions of table 1

C%	Si%	Mn%	P%	S%	Cr%	V%
							0.34	0.25	1.2	0.01	0.005	0.05	0.1

Its mechanical property is shown in Table 2：

The S34MnV mechanical properties of table 2

Yield strength (MPa)	Tensile strength (Mpa)	Elongation
			395Mpa	650Mpa	30%

The welding repair method of the crank axle for vessel local defect is without weld preheating, but by cold welding method to described The local defect of crankshaft surface is repaired.

The welding repair method includes：

Welding preparation

Referring to Fig. 1, before REPAIR WELDING, the local defect to crankshaft surface carries out reconditioning processing, makes the to be repaired of bent axle Complex surface formation welding groove, groove, in 50~60 degree of angles, makes welding position rounding off with crankshaft surface, and to weld part Cleaning treatment is carried out in the range of the surrounding 50mm of position.

Argon arc welding forms prime coat

Referring to Fig. 2, after groove prepares and soldering areas adjacent is cleaned out, backing welding is carried out using argon tungsten-arc welding Connect；Welding wire is GTN-Ni1, is pure nickel argon-arc welding wire, and 2.0 millimeters of diameter, welding wire meets AWS A5.14ERNi-1 standards；Weldering The purity of argon used is connect for >=99.99%, gas flow is 10~12L/min；Welding current is 150~200A, and electric arc is long Spend 1~3mm；Welding wire welding gun is swung in crescent, and amplitude of fluctuation is 1~2mm；The thickness of prime coat 1 is 2~3mm.

CO₂Gas shielded arc welding is filled the welding of capping layer

Referring to Fig. 2, after the completion of bottom argon arc welding, using CO₂Gas shielded arc welding carries out welding filling capping layer 2；Welding wire For GFL-71Ni, diameter 1.2mm, welding wire meets AWS A5.20E71T-1 standards；Welding uses pure CO₂Gas, gas purity It is required that more than 99.98, CO₂Gas flow is 15~25L/min；180~220A of welding current, 25~28V of voltage；Welding wire is dry to be stretched Length 15-25mm, welding gun is swung in crescent, and amplitude of fluctuation is 1~2mm；Welding is until filling up welding groove and being higher by mother 1~2mm of material surface.

Reconditioning polishing is carried out to repairing surface

Welding terminate after 24 hours, to welding position carry out MT magnetic powder inspections, it is qualified after to welding position carry out reconditioning throwing Light.

The present invention, can with very strong application value for the reparation of the crank axle for vessel local defect of S34MnV materials Cost is reprocessed in reduction, while technique is simple, it is workable, with good application prospect.

It is above presently preferred embodiments of the present invention, for persons skilled in the art, without departing substantially from of the invention former Any obvious equivalent or equivalent modifications on the premise of reason and spirit to made by it, should all be contemplated as falling with this Within invention scope of the claims.

Claims

1. a kind of welding repair method of crank axle for vessel local defect, the material of the bent axle is S34MnV, it is characterised in that do not entered Row weld preheating, but the local defect of the crankshaft surface is repaired by cold welding method, the welding repair method bag Include, the defect to the crankshaft surface carries out grinding process before welding, then forms prime coat using argon arc welding, then uses CO₂Gas shielded arc welding is filled the welding of capping layer, finally carries out reconditioning polishing to repairing surface.

2. the welding repair method of crank axle for vessel local defect according to claim 1, it is characterised in that described in weldering The local defect to the crankshaft surface, which is carried out at reconditioning, to be referred to the defect progress grinding process of the crankshaft surface before connecing Reason, forms welding groove, the surface of the groove and the bent axle is in 50~60 degree of angles, makes welding position rounding off, and right Region around welding position in the range of 50mm carries out cleaning treatment.

3. the welding repair method of crank axle for vessel local defect according to claim 1, it is characterised in that described use Argon arc welding forms prime coat and referred to, is entered using a diameter of 2.0 millimeters of pure nickel argon arc welding GTN-Ni1 welding wires by argon tungsten-arc welding Row bottoming is welded, and its welding condition is as follows：Welding current is 150~200A, and arc length is 1~3mm；Using argon gas Purity >=99.99%, gas flow is 10~12L/min；Welding gun is swung in crescent, and amplitude of fluctuation is 1~2mm；Formed The thickness of prime coat is 2~3mm；The GTN-Ni1 welding wires meet AWS A5.14ERNi-1 standards.

4. the welding repair method of crank axle for vessel local defect according to claim 1, it is characterised in that described use CO₂The welding that gas shielded arc welding is filled capping layer refers to, CO is passed through using a diameter of 1.2mm GFL-71Ni welding wires₂Gas Protection weldering carries out welding filling capping layer, and its welding condition is as follows：Welding current is 180~220A, and weldingvoltage is 25 ~28V；Using CO₂Purity >=99.98% of gas, gas flow is 15~25L/min；Welding gun is swung in crescent, is swung Amplitude be 1~2mm, dry extension of electrode degree be 15-25mm, welding until fill up the groove and the filling capping layer it is upper Surface is higher by 1~2mm of mother metal surface；The GFL-71Ni welding wires meet AWS A5.20E71T-1 standards.

5. the welding repair method of crank axle for vessel local defect according to claim 1, it is characterised in that described to repairing Complex surface carry out reconditioning polishing refers to, welding terminate after 24 hours, to welding position carry out MT magnetic powder inspections, it is qualified after to welding Position carries out reconditioning polishing.