CN102794538A - Welding method for improving low-temperature impact toughness of low carbon martensite stainless steel welded joint - Google Patents
Welding method for improving low-temperature impact toughness of low carbon martensite stainless steel welded joint Download PDFInfo
- Publication number
- CN102794538A CN102794538A CN2012102547057A CN201210254705A CN102794538A CN 102794538 A CN102794538 A CN 102794538A CN 2012102547057 A CN2012102547057 A CN 2012102547057A CN 201210254705 A CN201210254705 A CN 201210254705A CN 102794538 A CN102794538 A CN 102794538A
- Authority
- CN
- China
- Prior art keywords
- welding
- temperature
- stainless steel
- treatment
- weld
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Heat Treatment Of Articles (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to a welding process, and in particular relates to a welding method for improving the low-temperature impact toughness of a low carbon martensite stainless steel welded joint. The welding method comprises the steps of a pre-welding treatment, a preheating treatment, a welding treatment and an after-welding heat treatment, wherein the temperature of the thermal treatment is 540-570 DEG C. The invention provides a unique process method, the Nieq/Creq equivalence ratio of a welding material is improved based on an original welding process scheme, the energy of a welding wire and foreign carbon leaking into a welded joint are reduced, and simultaneously the post-welding temper temperature is slightly increased.
Description
Technical field
The present invention relates to a kind of welding procedure, especially relate to a kind of welding method that improves Low Carbon Martensite Stainless Steel weld seam low-temperature impact toughness.
Background technology
Large-scale blade is special because of material, the placing difficulty is big, manufacturing process is complicated, over a long period of time dependence on import.At present, through the research and development of more domestic companies, grasped the manufacturing of this Large-Scale Equipment basically.Its material is ZG06Cr13Ni4Mo, belongs to Low Carbon Martensite Stainless Steel.For reducing cavitation corrosion and sand erosion take place in the blade use, reduce the blade fatigue crack, increase reliability, the stability of generating efficiency, client has very strict requirement to the inside and outside quality of blade.Mechanical property leading indicator: tensile strength>=800MPa, 0 ℃ of impact flexibility AK
V>=100J.For the repair welding of defective on the blade ,-20 ℃ of impact flexibility of welded seam require AK
V>=35J.Blade integral will carry out nondestructive inspection and detect, and need excavate totally the blade excessive defect, carries out soldering according to the welding procedure of submitting to client to examine.After the soldering blade integral is carried out the postwelding stress-removal, and weld is carried out NDT recheck, hardness detects.
Though at present allotment has realized the combination property requirement of blade high-yield-ratio and high-plasticity with optimization of Heat Treatment Process through chemical composition: tensile strength on average more than 820MPa, 0 ℃ of impact flexibility AK
VBasically more than 120J ,-20 ℃ AK
VAlso more than 100J.But the impact flexibility of weld seam is difficult to reach the way that requirement does not also address this is that at present.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of process Nieq/Creq equivalent proportion unique, raising wlding on the basis of former welding procedure scheme is provided, reduces weld heat input, reduces a kind of welding method that improves Low Carbon Martensite Stainless Steel weld seam low-temperature impact toughness that external carbon infiltrates weld seam, improves the postwelding temperature simultaneously slightly.
In order to realize goal of the invention, the present invention realizes through following mode:
A kind of welding method that improves Low Carbon Martensite Stainless Steel weld seam low-temperature impact toughness is characterized in that: this method comprises the steps:
A. pre-welding treatment: fall the carbon black in weld defect and the peripheral 200mm scope thereof with dross extractor or grinder buffing;
B. preheating: adopt the natural gas preheating, preheat temperature is 50～100 ℃; Temperature test is used the hand-held infrared thermometer;
C. welding: select manual electric arc welding for use, the welding rod material is C≤0.04%, Si≤0.6%, Mn≤1.0%; Cr=12.0～13.5%, Mo=0.4～0.6%, Ni=3.8～5.0%; Adopt the welding rod of φ 5.0, welding current is that 160～230A, voltage are that 19～25V, speed of welding are Min10cm/min, and the width of single-pass welding is 6～10mm; Thickness is 3～5mm, and weld heat input is 8.4～10.2 KJ/cm, and interlayer temperature is 150～200 ℃;
D. post weld heat treatment: heat treatment temperature is 540～570 ℃.
The present invention has following effect:
1) technology is simple, and is workable: method provided by the invention is a, pre-welding treatment: the blemish surface relief grinding of gouge being crossed with abrasive machine falls 1～2mm, falls carbon black and iron rust in weld defect and the peripheral 200mm scope thereof with dross extractor or grinder buffing; B, preheating: adopt the natural gas preheating, preheat temperature is 50～100 ℃; Temperature test is used the hand-held infrared thermometer; C, welding: select manual electric arc welding for use, the welding rod material is C≤0.04%, Si≤0.6%, Mn≤1.0%; Cr=12.0～13.5%, Mo=0.4～0.6%, Ni=3.8～5.0%; Adopt the welding rod of φ 5.0, welding current is that 160～230A, voltage are that 19～25V, speed of welding are Min10cm/min, and the width of single-pass welding is 6～10mm; Thickness is 3～5mm, and weld heat input is 8.4～10.2 KJ/cm, and interlayer temperature is 150～200 ℃; D, post weld heat treatment: heat treatment temperature is 540～570 ℃; Adopt above technology controlling and process measure, the weld zone average hardness can be controlled at about HB285 ,-20 ℃ AK
VAverage is about 40J, reaches the customer requirement greater than 35J, before improving, has improved 100%.And adopting above method, technology is simple, and is workable.
2) the Nieq/Creq equivalent proportion of control wlding: the present invention is according to the chemical composition of a large amount of blade body and the contrast statistics of tissue, draws when Nieq/Creq=0.42～0.45, just do not having delta ferrite and combination property better in the tempered structure basically.Wherein, Nieq %=Ni+30 (C+N)+0.5Mn (%), Creq%=Cr+Mo+1.5Si (%), each element is mass percent % in the formula.To requiring the equicohesive martensite type welding material emphasis composition close to control, satisfy the Nieq/Creq ratio and require in view of the above with the mother metal composition.
3) reduce weld heat input: according to the expression formula E=η (UI/V) of weld heat input; In the formula: U-arc voltage (V); I-welding current (A), V-speed of welding (m/s), η-power coefficient of efficiency (SMAW is 0.74～0.87, submerged-arc welding is 0.77～0.90, ac tungsten inert gases welding is 0.68～0.85, direct current argon tungsten-arc welding be 0.78～0.85); Do not have when special instruction, get median.Preferentially select manual electric arc welding (SMAW) for use, adopt the welding rod of φ 5.0.Weld heat input by original 10.2～15.6KJ/ cm, is reduced to 8.4～10.2 KJ/ cm.Interlayer temperature is controlled at below 200 ℃.Preheat temperature drops to below 100 ℃ during the soldering defective.Because of having reduced weld seam heat input, refinement the grain size of overheated zone, heat affected area, reduced in the seam organization cooling procedure carbide and separated out, reduce the scaling loss of Cr in welding, reduce the chance that airborne N infiltrates weld seam.Thereby guaranteed stable and metallographic structure good of weld seam chemical composition.Do not carry out post weld heat treatment after the welding, weld metal hardness promptly can be controlled in HB320 ~ 340, with the weld metal hardness of former welding parameter welding more than HB340.
4) reduce external carbon and infiltrate weld seam: because of blade material is a Mo ultralow-carbon martensitic stainless steel, the increase of carbon can improve weld hardness, simultaneously, worsens impact flexibility.So the weld seam carburetting behavior in welding process is stopped in strictness.Measure has: the defective of 1) avoiding carbon arc air gouging to cross is cheated surperficial carburetting.To the blade defective that adopts carbon arc air gouging to cross, the blemish surface relief grinding of gouge being crossed with abrasive machine falls 1～2mm, and the relief grinding light welds again, even blemish surface has the carburetting phenomenon, can be fallen by relief grinding.2) avoid the flame preheating to the carburetting of welding fault location.My company adopts the natural gas preheating to blade defective locations place, because combustion of natural gas is insufficient, can stay thick carbon black at cast(ing) surface.Need before welding, carefully polish off the carbon black in weld defect and the peripheral 200mm scope thereof with dross extractor and emery wheel, anti-blocking infiltrates weld seam especially in the heat affected area, worsens welding seam tissue capability and also reduces impact flexibility for this reason.
5) improve postwelding stress-removal temperature a little.Because of client's regulation postwelding temperature must be lower than the temperature of property heat treatment, and to be higher than 539 ℃.Taking into account under the required tempering range of blade high strength, confirming that the normal post weld heat treatment temperature of blade is 540～570 ℃.According to the situation of concrete cast properties, select higher postwelding temperature for use, as 565 ℃, and keep enough tempering times, make weld seam M tissue decomposed softening fully.What simultaneously, residual stress of casting was eliminated is more thorough.
The specific embodiment
A kind of welding method that improves Low Carbon Martensite Stainless Steel weld seam low-temperature impact toughness is characterized in that: this method comprises the steps:
A. pre-welding treatment: the blemish surface relief grinding of gouge being crossed with abrasive machine falls 1～2mm, falls carbon black and iron rust in weld defect and the peripheral 200mm scope thereof with dross extractor or grinder buffing;
B. preheating: adopt the natural gas preheating, preheat temperature is 50～100 ℃; Temperature test is used the hand-held infrared thermometer;
C. welding: select manual electric arc welding for use, the welding rod material is C≤0.04%, Si≤0.6%, Mn≤1.0%; Cr=12.0～13.5%, Mo=0.4～0.6%, Ni=3.8～5.0%; Adopt the welding rod of φ 5.0, welding current is that 160～230A, voltage are that 19～25V, speed of welding are Min10cm/min, and the width of single-pass welding is 6～10mm; Thickness is 3～5mm, and weld heat input is 8.4～10.2 KJ/cm, and interlayer temperature is 150～200 ℃;
D. post weld heat treatment: heat treatment temperature is 540～570 ℃.
Claims (2)
1. welding method that improves Low Carbon Martensite Stainless Steel weld seam low-temperature impact toughness, it is characterized in that: this method comprises the steps:
A. pre-welding treatment: the blemish surface relief grinding of gouge being crossed with abrasive machine falls 1～2mm, falls carbon black and iron rust in weld defect and the peripheral 200mm scope thereof with dross extractor or grinder buffing;
B. preheating: adopt the natural gas preheating, preheat temperature is 50～100 ℃; Temperature test is used the hand-held infrared thermometer;
C. welding: select manual electric arc welding for use, the welding rod material is C≤0.04%, Si≤0.6%, Mn≤1.0%; Cr=12.0～13.5%, Mo=0.4～0.6%, Ni=3.8～5.0%; Adopt the welding rod of φ 5.0, welding current is that 160～230A, voltage are that 19～25V, speed of welding are Min10cm/min, and the width of single-pass welding is 6～10mm; Thickness is 3～5mm, and weld heat input is 8.4～10.2 KJ/cm, and interlayer temperature is 150～200 ℃;
D. post weld heat treatment: heat treatment temperature is 540～570 ℃.
2. a kind of welding method that improves Low Carbon Martensite Stainless Steel weld seam low-temperature impact toughness as claimed in claim 1; It is characterized in that: the blemish surface relief grinding that said pre-welding treatment is crossed gouge with abrasive machine falls 1～2mm, falls carbon black and iron rust in weld defect and the peripheral 200mm scope thereof with dross extractor or grinder buffing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102547057A CN102794538A (en) | 2012-07-23 | 2012-07-23 | Welding method for improving low-temperature impact toughness of low carbon martensite stainless steel welded joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102547057A CN102794538A (en) | 2012-07-23 | 2012-07-23 | Welding method for improving low-temperature impact toughness of low carbon martensite stainless steel welded joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102794538A true CN102794538A (en) | 2012-11-28 |
Family
ID=47193976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102547057A Pending CN102794538A (en) | 2012-07-23 | 2012-07-23 | Welding method for improving low-temperature impact toughness of low carbon martensite stainless steel welded joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102794538A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104400180A (en) * | 2014-10-27 | 2015-03-11 | 中核苏阀横店机械有限公司 | Repair welding process of high alloy steel track shoe |
| CN104690395A (en) * | 2015-03-18 | 2015-06-10 | 上海振华重工(集团)股份有限公司 | Method for welding balance supporting block of large gate |
| CN105149727A (en) * | 2015-09-24 | 2015-12-16 | 共享铸钢有限公司 | Medium carbon steel defect removal method |
| CN106312242A (en) * | 2016-10-21 | 2017-01-11 | 中国化学工程第六建设有限公司 | Welding method for 12Cr5Mo martensite stainless steel |
| CN107127476A (en) * | 2017-04-28 | 2017-09-05 | 华中科技大学 | It is a kind of to be used for the special welding wire that martensitic stain less steel is welded in continuous rolling unit |
| CN108856964A (en) * | 2018-06-29 | 2018-11-23 | 共享铸钢有限公司 | A kind of production method preventing the irrelevant magnetic particle indications of steel-casting |
| CN110809632A (en) * | 2017-06-30 | 2020-02-18 | 艾普伦 | Method for spot welding of martensitic stainless steel plate |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101176942A (en) * | 2007-12-03 | 2008-05-14 | 鞍钢重型机械有限责任公司金属结构厂 | Method for welding OCr13Ni5Mo low-carbon martensitic stainless steel |
| CN101596640A (en) * | 2008-06-06 | 2009-12-09 | 中国海洋石油总公司 | The welding procedure of super martensitic stainless steel |
-
2012
- 2012-07-23 CN CN2012102547057A patent/CN102794538A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101176942A (en) * | 2007-12-03 | 2008-05-14 | 鞍钢重型机械有限责任公司金属结构厂 | Method for welding OCr13Ni5Mo low-carbon martensitic stainless steel |
| CN101596640A (en) * | 2008-06-06 | 2009-12-09 | 中国海洋石油总公司 | The welding procedure of super martensitic stainless steel |
Non-Patent Citations (4)
| Title |
|---|
| 张立文等: "应用红外线对触头焊接温度的控制", 《电气开关》 * |
| 范潇等: "抽水蓄能机组水轮机转轮装焊制造技术", 《抽水蓄能电站工程建设文集（2009）》 * |
| 陈坚等: "水轮机转轮室的焊接工艺", 《金属加工(热加工)》 * |
| 马丽等: "ZG06Cr13Ni4Mo材料显微组织分析", 《宁夏机械》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104400180A (en) * | 2014-10-27 | 2015-03-11 | 中核苏阀横店机械有限公司 | Repair welding process of high alloy steel track shoe |
| CN104690395A (en) * | 2015-03-18 | 2015-06-10 | 上海振华重工(集团)股份有限公司 | Method for welding balance supporting block of large gate |
| CN105149727A (en) * | 2015-09-24 | 2015-12-16 | 共享铸钢有限公司 | Medium carbon steel defect removal method |
| CN105149727B (en) * | 2015-09-24 | 2017-11-28 | 共享铸钢有限公司 | A kind of medium carbon steel casting defect minimizing technology |
| CN106312242A (en) * | 2016-10-21 | 2017-01-11 | 中国化学工程第六建设有限公司 | Welding method for 12Cr5Mo martensite stainless steel |
| CN107127476A (en) * | 2017-04-28 | 2017-09-05 | 华中科技大学 | It is a kind of to be used for the special welding wire that martensitic stain less steel is welded in continuous rolling unit |
| CN107127476B (en) * | 2017-04-28 | 2019-06-18 | 华中科技大学 | A kind of special welding wire welded for martensitic stain less steel in continuous rolling unit |
| CN110809632A (en) * | 2017-06-30 | 2020-02-18 | 艾普伦 | Method for spot welding of martensitic stainless steel plate |
| CN110809632B (en) * | 2017-06-30 | 2021-10-08 | 艾普伦 | Method for spot welding of martensitic stainless steel plate |
| US11478873B2 (en) | 2017-06-30 | 2022-10-25 | Aperam | Method for welding using points of martensitic stainless steel sheets |
| CN108856964A (en) * | 2018-06-29 | 2018-11-23 | 共享铸钢有限公司 | A kind of production method preventing the irrelevant magnetic particle indications of steel-casting |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102794538A (en) | Welding method for improving low-temperature impact toughness of low carbon martensite stainless steel welded joint | |
| CN103769728B (en) | With flux-cored wire CO2The technique of gas shield welding soldering cast steel part defect | |
| CN103231155B (en) | Easy-welding high-strength large-thickness steel plate preheating-free gas shielded welding process | |
| CN103481010B (en) | A kind of full-automatic online cold welding pattching roll squeezer technique | |
| CN109590668A (en) | A kind of steam turbine cylinder sealing surface renovation technique | |
| CN101514430A (en) | Chromium-molybdenum-vanadium steel and repairing technology for chromium-molybdenum-vanadium steel casting | |
| CN104924018B (en) | A kind of Large Rotor big cross section crackle field repairing method | |
| CN109079421B (en) | A kind of method that locomotive buffer bar surface reconditioning remanufactures | |
| CN102896466B (en) | Production method of 150-400mm thick steel plate for plastic moulds | |
| CN105436665A (en) | Surfacing reconstructed layer of large hot-rolled supporting roll Cr4 and method for repairing roll | |
| CN106868425B (en) | The post weld heat treatment method of the high tough cut deal welding point low-temperature impact toughness of Mn in a kind of low C of improvement 690MPa levels | |
| CN101722384A (en) | Flux-cored wire and method for welding cold-rolled back-up roll by same | |
| CN111283308B (en) | All-position shielded metal arc welding process for ultralow-temperature 304LN austenitic stainless steel medium plate | |
| CN102658417A (en) | Welding repair technology of casting defect of high-chromium cast iron | |
| CN101722383A (en) | Flux-cored wire and method for welding cold-rolled work roll by same | |
| CN105665898A (en) | Automatic submerged arc welding method for pearlitic heat-resistant steel composite board | |
| Westin et al. | Effect of laser and laser hybrid welding on the corrosion performance of a lean duplex stainless steel | |
| WO2016110159A1 (en) | Method for welding and repairing rack crack of four-roll plate bending machine | |
| CN114734125B (en) | Preheating-free welding method suitable for 500 HB-grade wear-resistant steel | |
| CN101722385A (en) | Flux-cored wire and method for welding hot-rolled back-up roll by same | |
| CN108856945A (en) | A kind of welding repair method of heat resisting steel material casting | |
| CN114406512B (en) | Welding and electric pulse heat treatment process for dissimilar alloy | |
| CN103084718B (en) | Welding method for 10CrMo9-10 steel | |
| CN103182591B (en) | Welding process for ultra-thick high-strength quenched and tempered S500Q steel plates for hydraulic turbine | |
| CN101791746A (en) | Large high-temperature refractory steel pipeline welding process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121128 |