CN101774063A - Defect repair welding process of stainless steel composite board coating - Google Patents
Defect repair welding process of stainless steel composite board coating Download PDFInfo
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- CN101774063A CN101774063A CN201010011455A CN201010011455A CN101774063A CN 101774063 A CN101774063 A CN 101774063A CN 201010011455 A CN201010011455 A CN 201010011455A CN 201010011455 A CN201010011455 A CN 201010011455A CN 101774063 A CN101774063 A CN 101774063A
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Abstract
The invention relates to a defect repair welding process of a stainless steel composite board coating, belonging to the technical field of metal welding, and relating to a defect repair welding process of stainless steel composite board coating aiming at the defect of the stainless composite board coating. The process is characterized by comprising the following steps of: removing a coating material with defects; removing a base layer material to form a step between the base layer material and the coating material; transiting the surface of a groove and the bottom of a welding line with a circular angle; welding the base layer by a welding rod arc welding; welding a transition layer by short arc operation; and welding a coating cap by adopting welding rod arc welding. The invention overcomes the defects that crack is easy to occur in the bead weld, poor influence is generated to the performance of base metal thermal influence area in the thermal welding process, and the like, effectively prevents the interface of the base layer material and the coating material from generating crack, ensures the weld bead height of the base layer without damaging the coating, and is beneficial to guaranteeing the welding quality of the coating.
Description
Technical field
Defect repair welding process of stainless steel composite board coating belongs to the metal welding techniques field, is specifically related to a kind of defect repair welding process of stainless steel composite board coating at the stainless steel composite board coating defective.
Background technology
Stainless steel clad plate by stainless steel and mild steel or two kinds of materials of low-alloy steel through blast, rolling or rolling the forming of exploding.Intensity, rigidity and toughness that it had both had base material have the corrosion resistance of clad material again, and have advantages such as cheap, are widely used in fields such as petrochemical industry, nuclear power.In composite plate manufacturing or military service process, defectives such as crackle, incomplete fusion, slag inclusion often appear in clad material, and welding method is the main means of repairing the composite plate defective at present.And the compound layer of stainless steel has lower thermal conductivity and bigger thermal coefficient of expansion, in process of patch weld, can produce bigger residual stress, cracks, and becomes one of principal element that influences the composite plate structure integrality.In addition, welding method belongs to the dissimilar metal welding, and quality control has certain degree of difficulty.Compare with butt welding, the constraint (restraint) degree of built-up welding is bigger, the easier crackle that occurs, and the sweating heat process is also influential to the performance of mother metal heat affected area.Most of stainless steel clad plates are used to make the equipment of withstand voltage, the anticorrosion container in fields such as oil refining, chemical industry, and the work under bad environment of these equipment has proposed higher requirement to the repair welding technology.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, provide a kind of technology simple, repair welding is effective, groove metal surface flawless, the flawless defect repair welding process of stainless steel composite board coating in the interface of coating and basic unit.
The technical solution adopted for the present invention to solve the technical problems is: this defect repair welding process of stainless steel composite board coating is characterized in that: adopt following processing step:
1.1 remove defective clad material;
1.2 the removal base material makes and forms a step between base material and the clad material;
1.3 finished edge, bevel angle are 35 °～45 °, groove face and weld seam bottom are with round-corner transition, and radius R is 1～2mm;
1.4 remove the objectionable impurities in groove and the mother metal both side surface 200mm scope thereof;
1.5 basic unit's welding is adopted the SMAW welding, core diameter φ 3.2, welding current 100～120A, voltage 22～24V, speed of welding 1～2mm/s;
1.6 short arc operation is adopted in the transition zone welding, core diameter is φ 3.2, and electric current is 120～140A, and voltage is 22～24V, and speed is 1.5～2.5mm/s, and welding rod needs to do short stay in the groove both sides during welding, fully fuses to guarantee weld seam and base metals;
1.7 the coating cap weld adopts the SMAW welding, core diameter is φ 3.2, and electric current is 130～150A, and voltage is 23～25V, and speed is 1.5～2.5mm/s.
The removal length of clad material is not less than 100mm, and width is not less than 30mm, and it is 1～3mm that base material is removed the degree of depth, and width is less than the removal width of clad material.
Described length of bench is 3～5mm.Can effectively avoid the interface of base material and clad material to crack, it is concordant with step simultaneously basic unit's weld metal to be welded to, and guarantees basic unit's weld bead height; In addition, when the welding transition layer, can not damage coating again, help guaranteeing the coating welding quality.
Transition region thickness is: 1～1.5mm on coating and the basic unit interface, 1.5～2.5mm under the interface.The weld seam gross thickness is not less than 3mm.
The interior brush of scope one deck white powder slurry or bedding asbestos cloth that coating side weld groove both sides 200mm is wide are in order to avoid spatter injury surface of steel plate.
After welding finishes, knocking immediately, the knocking scope comprises weld seam and weld seam both sides mother metal, the knocking width is 50～60mm,
In the welding process, welding rod is not swung.
Welding rod is dried 2h before the welding in drying baker, and insulation.The used welding rod of basic unit's weld seam is identical or close with the basic unit material, transition zone welds used welding rod intensity should be able to guarantee that the intensity of weld seam and joint is not less than the intensity of intensity than the downside mother metal, simultaneously the plasticity of weld metal and the performance that impact flexibility is not less than intensity upper side mother metal.It is identical with clad material that coating welds used welding rod.
With the method for dye penetrant inspection, detect the groove crack of metal surface, adopt defect detection on ultrasonic basis then, detect the boundary defect of coating and basic unit.
Compared with prior art, the beneficial effect that defect repair welding process of stainless steel composite board coating of the present invention had is: overcome built-up welding and occurred crackle easily, the sweating heat process produces defectives such as harmful effect to the performance of mother metal heat affected area, effectively avoid the interface of base material and clad material to crack, guarantee basic unit's weld bead height, can not damage coating, favourable assurance coating welding quality.After repair welding finishes, 100% dye penetrating is carried out on the repair welding surface detect defectives such as finding the built-up welding district does not crack, incomplete fusion.In addition, the repair welding district is carried out 100% ultrasonic examination inspection, the fusion situation of transition zone, capping layer is intact.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Wherein: 1 base material, 2 cover materials, 3 cover material weld seams, 4 transition zone weld seams, 5 basic unit's weld seams.
Fig. 1～2nd, the most preferred embodiment of defect repair welding process of stainless steel composite board coating of the present invention, the present invention will be further described below in conjunction with accompanying drawing 1～2:
The specific embodiment
Embodiment 1
With reference to accompanying drawing 1:
Stainless steel clad plate, base material 1 is 16MnR, satisfies the strength and stiffness requirement of equipment, cover material 2 is the 0Cr13Al stainless steel, satisfies medium to acid proof requirement.In manufacture process, crackle appears in the coating side, therefore, adopts the method for built-up welding to carry out repair welding.Concrete steps are:
The clad material that at first will have defective is removed, and removal length is 100mm, and width is 30mm; Dig 1mm with under the base material then, width is mended width by replacing a damaged part less than cover material 2, make to form a step between base material 1 and the cover material 2, length of bench 3mm cracks with the interface of avoiding base material 1 and cover material 2, can make simultaneously basic unit's weld seam 5 metal welding to concordant with step, guarantee basic unit's weld seam 5 height, simultaneously, when the welding transition layer, can not damage coating again, help guaranteeing the coating welding quality.The finished edge angle is 35 °, and groove face and weld seam bottom are with round-corner transition, and radius R is 1mm.Moisture, oxide, greasy dirt, iron rust, slag and other objectionable impurities of removing in bevelled edge and mother metal both side surface 20mm scope thereof.With the method for dye penetrant inspection, guarantee groove metal surface flawless, adopt defect detection on ultrasonic basis then, guarantee the interface zero defect of coating and basic unit.The welding ground floor: basic unit's welding, adopt the SMAW welding, type of electrode J507, diameter phi 3.2, welding current 100～120A, voltage 22～24V, speed of welding 1～2mm/s.After welding finishes, knocking immediately, the knocking scope comprises weld seam and weld seam both sides mother metal, the knocking width is 50mm.The second layer is the transition zone welding, transition region thickness is: 1.5mm on coating and the basic unit interface, and 2mm under the interface, whole transition zone weld seam 4 welding are to guarantee under the welding fusion good premise, reduce the deposited amount of parent metal as far as possible, adopt little standard, do not swing, unidirectional welding method.Type of electrode is A307, and core diameter is φ 3.2, and electric current is 120～140A, and voltage is 22～24V, and speed is 1.5～2.5mm/s.Coating around the weld seam should be cleaned out, expose metallic luster, can prevent effectively that like this hydrogen from fusing into weld seam, thereby prevent the generation of cold crack.Welding rod is dried 2h before the welding in drying baker, then insulation.Should use insulation wound packages welding rod during welding, ready access upon use.Adopt short arc operation, welding rod stops slightly in the groove both sides, fully fuses to guarantee weld seam and base metals.When multi-pass welding connect, the strict control of interlayer temperature prevented the generation of crackle.Should note filling up arc crater when receiving arc, otherwise be prone to crackle.The 3rd layer is the coating cap weld, adopts the SMAW welding.Type of electrode is A307, and core diameter is φ 3.2, and electric current is 130～150A, and voltage is 23～25V, and speed is 1.5～2.5mm/s.The interior brush of scope one deck white powder slurry or bedding asbestos cloth that all coating side weld groove both sides 200mm are wide are in order to avoid spatter injury surface of steel plate.During the coating welding, adopt little standard single track not swing welding.The polishing of coating face of weld is carried out Welding Testing again to or rounding off concordant substantially with the mother metal surface.Knocking immediately after coating has welded, the knocking scope comprises weld seam and weld seam both sides mother metal, width range is about 50mm, with crystal grain thinning, reduces residual stress.After repair welding finishes, 100% dye penetrating is carried out on the repair welding surface detect, the built-up welding district does not have defectives such as crackle, incomplete fusion.The repair welding district is carried out 100% ultrasonic examination inspection, and the fusion situation of transition zone, capping layer is intact.
Embodiment 2
Stainless steel clad plate, base material 1 is 16MnR, satisfies the strength and stiffness requirement of equipment, cover material 2 is the 0Cr13Al stainless steel, satisfies medium to acid proof requirement.In manufacture process, crackle appears in the coating side, therefore, adopts the method for built-up welding to carry out repair welding.Concrete steps are:
The clad material that at first will have defective is removed, and removal length is 150mm, and width is 50mm; Dig 3mm with under the base material then, width is mended width by replacing a damaged part less than cover material 2, make to form a step between base material 1 and the cover material 2, length of bench 5mm cracks with the interface of avoiding base material 1 and cover material 2, can make simultaneously basic unit's weld seam 5 metal welding to concordant with step, guarantee basic unit's weld seam 5 height, simultaneously, when the welding transition layer, can not damage coating again, help guaranteeing the coating welding quality.The finished edge angle is 45 °, and groove face and weld seam bottom are with round-corner transition, and radius R is 2mm.Moisture, oxide, greasy dirt, iron rust, slag and other objectionable impurities of removing in bevelled edge and mother metal both side surface 20mm scope thereof.With the method for dye penetrant inspection, guarantee groove metal surface flawless, adopt defect detection on ultrasonic basis then, guarantee the interface zero defect of coating and basic unit.The welding ground floor: basic unit's welding, adopt the SMAW welding, type of electrode J507, diameter phi 3.2, welding current 100～120A, voltage 22～24V, speed of welding 1～2mm/s.After welding finishes, knocking immediately, the knocking scope comprises weld seam and weld seam both sides mother metal, the knocking width is 60mm.The second layer is the transition zone welding, transition region thickness is: 1.5mm on coating and the basic unit interface, and 2.5mm under the interface, whole transition zone weld seam 4 welding are to guarantee under the welding fusion good premise, reduce the deposited amount of parent metal as far as possible, adopt little standard, do not swing, unidirectional welding method.Type of electrode is A307, and core diameter is φ 3.2, and electric current is 120～140A, and voltage is 22～24V, and speed is 1.5～2.5mm/s.Coating around the weld seam should be cleaned out, expose metallic luster, can prevent effectively that like this hydrogen from fusing into weld seam, thereby prevent the generation of cold crack.Welding rod is dried 2h before the welding in drying baker, then insulation.Should use insulation wound packages welding rod during welding, ready access upon use.Adopt short arc operation, welding rod stops slightly in the groove both sides, fully fuses to guarantee weld seam and base metals.When multi-pass welding connect, the strict control of interlayer temperature prevented the generation of crackle.Should note filling up arc crater when receiving arc, otherwise be prone to crackle.The 3rd layer is the coating cap weld, adopts the SMAW welding.Type of electrode is A307, and core diameter is φ 3.2, and electric current is 130～150A, and voltage is 23～25V, and speed is 1.5～2.5mm/s.The interior brush of scope one deck white powder slurry or bedding asbestos cloth that all coating side weld groove both sides 200mm are wide are in order to avoid spatter injury surface of steel plate.During the coating welding, adopt little standard single track not swing welding.The polishing of coating face of weld is carried out Welding Testing again to or rounding off concordant substantially with the mother metal surface.Knocking immediately after coating has welded, the knocking scope comprises weld seam and weld seam both sides mother metal, width range is about 60mm, with crystal grain thinning, reduces residual stress.After repair welding finishes, 100% dye penetrating is carried out on the repair welding surface detect, there are not defectives such as crackle, incomplete fusion in the built-up welding district.The repair welding district is carried out 100% ultrasonic examination inspection, and the fusion situation of transition zone, capping layer is intact.
The above only is preferred embodiment of the present invention, is not to be the restriction of the present invention being made other form, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solution of the present invention content that do not break away to any simple modification, equivalent variations and remodeling that above embodiment did, still belongs to the protection domain of technical solution of the present invention according to technical spirit of the present invention.
Claims (9)
1. defect repair welding process of stainless steel composite board coating is characterized in that: adopt following processing step:
1 removes defective clad material;
2 remove base material, make and form a step between base material and the clad material;
3 finished edges, bevel angle are 35 °～45 °, and groove face and weld seam bottom are with round-corner transition, and radius R is 1～2mm;
4 remove the objectionable impurities of groove and mother metal both side surface thereof;
The welding of 5 basic units is adopted the SMAW welding, core diameter φ 3.2, welding current 100～120A, voltage 22～24V, speed of welding 1～2mm/s;
Short arc operation is adopted in the welding of 6 transition zones, and core diameter is φ 3.2, and electric current is 120～140A, and voltage is 22～24V, and speed is 1.5～2.5mm/s;
7 coating cap welds adopt the SMAW welding, and core diameter is φ 3.2, and electric current is 130～150A, and voltage is 23～25V, and speed is 1.5～2.5mm/s.
2. according to the described defect repair welding process of stainless steel composite board coating of claim 1 step 1.1, it is characterized in that: the removal length of clad material is more than or equal to 100mm, width is more than or equal to 30mm, and it is 1～3mm that base material is removed the degree of depth, and width is less than the removal width of clad material.
3. according to the described defect repair welding process of stainless steel composite board coating of claim 1 step 1.2, it is characterized in that: described length of bench is 3～5mm.
4. according to the described defect repair welding process of stainless steel composite board coating of claim 1 step 1.6, it is characterized in that: transition region thickness is: 1～1.5mm on coating and the basic unit interface, 1.5～2.5mm under the interface.
5. according to claim 1 step 1.5 or 1.7 described defect repair welding process of stainless steel composite board coating, it is characterized in that: after welding finishes, knocking immediately, the knocking scope comprises weld seam and weld seam both sides mother metal, the knocking width is 50～60mm.
6. according to the described defect repair welding process of stainless steel composite board coating of claim 1 step 1.7, it is characterized in that: the interior brush of scope one deck white powder slurry or bedding asbestos cloth that coating side weld groove both sides 200mm is wide.
7. defect repair welding process of stainless steel composite board coating according to claim 1 is characterized in that: welding rod is dried 2h before the welding in drying baker, and insulation.
8. defect repair welding process of stainless steel composite board coating according to claim 1 is characterized in that: in the welding process, welding rod is not done teeter, the welding direction unanimity.
9. defect repair welding process of stainless steel composite board coating according to claim 1 is characterized in that: with the method for dye penetrant inspection, detect the groove crack of metal surface, adopt defect detection on ultrasonic basis then, detect the boundary defect of coating and basic unit.
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