CN105983766A - Low-carbon steel and alloy steel welding method - Google Patents
Low-carbon steel and alloy steel welding method Download PDFInfo
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- CN105983766A CN105983766A CN201510049357.3A CN201510049357A CN105983766A CN 105983766 A CN105983766 A CN 105983766A CN 201510049357 A CN201510049357 A CN 201510049357A CN 105983766 A CN105983766 A CN 105983766A
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Abstract
The invention discloses a low-carbon steel and alloy steel welding method, characterized by including the following steps: a, clearing oil stay, rust and dust 20 mm within inner and outer surfaces of two sides of a groove to expose metal gloss; b, clearing oil stain, rust and dust outside a pad to expose metal gloss; c, preheating to 270-350 DEG C; d, using a welding electrode that is a tungsten argon arc welding electrode 2-10 mm in diameter; e, setting a direct-current positive connection power type, welding current 75-100 A, arc voltage 12-14 V and protective gas flow 8-10 L/min for a tungsten argon arc welder; f, performing high-frequency arc striking, guiding a molten pool to a thicker part of a parent metal, narrowing the molten pool gradually, extinguishing arc slowly, and turning off protective gas; g, annealing after welding, and cooling at a speed of 80-150 DEG C/h. The low-carbon steel and alloy steel welding method enables improved comprehensive welding performance between low-carbon steel and alloy steel.
Description
Technical field
The invention belongs to field of machining, welding method between specifically a kind of mild steel and steel alloy.
Background technology
Between mild steel with steel alloy, inhomogeneities and the linear expansion coefficient of welding point chemical composition, metal structure and mechanical performance differ relatively big, make
In use producing additional stress between mild steel and steel alloy, these factors, to welding method, welding material, preheating and specification of heat treatment, the selection of joint form and equipment reliability of operation, have significant impact.When welding between mild steel with steel alloy, the interface between weld metal and mother metal heat affected area does not has a boundary line completely, there is the unmixed zone in fusion area, i.e. weld seam and the incomplete fusion zone in mother metal between them.Its composition is all different from weld seam or mother metal with performance, defines the transition zone of chemical composition, the decarburized layer formed in joint during welding and carburetting layer.The composition of transition zone and the performance of performance butt joint have an important impact, therefore when selecting welding material and welding procedure, the composition of weld metal to be considered and performance, simultaneously the composition of transition zone to be considered and performance.Weld metal is the most not easy to be sufficiently mixed with base metals chemical composition difference, then transition zone is the most obvious；When penetration ratio or dilution rate are the highest, transition zone is the most obvious；The time that fusion area metal liquid exists more length or liquid metal flow better, is the most easily mixed uniformly, and transition zone has reduced.Therefore, it can by some technological measure, transition zone suitably be controlled.
Summary of the invention
In place of it is an object of the invention to for Shortcomings in above-mentioned technology, a kind of method improving and welding combination property between mild steel with steel alloy is proposed.
The technical scheme realizing the object of the invention is as follows:
Welding method between a kind of mild steel and steel alloy, it is characterised in that comprise the steps of
A, remove the greasy dirt of groove both sides surfaces externally and internally 20 scopes, corrosion, dust and metallic luster should be exposed；
B, remove the greasy dirt outside backing plate, corrosion, dust and metallic luster should be exposed；
C. the pre-heat treatment, preheats temperature 270-350 DEG C；
D. welding rod uses tungsten argon arc welding rod, diameter 2-10mm；
E. TIG Welding Machine, its power type is straight polarity direct current, welding current 75-100A, arc voltage 12-14V, shield gas flow rate 8-10L/min；
F. carry out high-frequency arc strike, molten bath is guided into mother metal thicker part, be then gradually reduced molten bath slowly blow-out, finally close protective gas；
G. annealing after welding, rate of cooling is 80-150 DEG C/h.
Between a kind of mild steel and the steel alloy of the present invention, welding method can improve and welds combination property between mild steel with steel alloy.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, and its operating procedure is as follows:
Welding method between a kind of mild steel and steel alloy, comprises the steps of
A, remove the greasy dirt of groove both sides surfaces externally and internally 20 scopes, corrosion, dust and metallic luster should be exposed；
B, remove the greasy dirt outside backing plate, corrosion, dust and metallic luster should be exposed；
C. the pre-heat treatment, preheats temperature 270-350 DEG C；
D. welding rod uses tungsten argon arc welding rod, diameter 2-10mm；
E. TIG Welding Machine, its power type is straight polarity direct current, welding current 75-100A, arc voltage 12-14V, shield gas flow rate 8-10L/min；
F. carry out high-frequency arc strike, molten bath is guided into mother metal thicker part, be then gradually reduced molten bath slowly blow-out, finally close protective gas；
G. annealing after welding, rate of cooling is 80-150 DEG C/h.
Welding method between a kind of mild steel and the steel alloy of the present invention, can obtain more preferable welding performance, weld preheating in preheating, control interlayer temperature；Post weld heat treatment eliminates stress, uses tungsten argon arc welding rod can avoid during multiple-bead deposit and ftractures, and argon has fabulous protective effect, can effectively completely cut off surrounding air；Itself neither with metal chemically reactive, be also insoluble in metal so that the reaction in welding process is simple and easy to control, therefore obtain better quality weld seam provide good condition；Tungsten electrode arc is highly stable, even if < still can stably burn in the case of 10A at very small area analysis.
The preferred embodiment of the present invention described in detail above.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work.Therefore, all technical staff in the art, all should be at the protection domain being defined in the patent claims the most on the basis of existing technology by logic minute analysis, reasoning or the available technical scheme of limited experiment.
Claims (1)
1. a welding method between mild steel and steel alloy, it is characterised in that comprise the steps of
A, remove the greasy dirt of groove both sides surfaces externally and internally 20 scopes, corrosion, dust and metallic luster should be exposed；
B, remove the greasy dirt outside backing plate, corrosion, dust and metallic luster should be exposed；
C. the pre-heat treatment, preheats temperature 270-350 DEG C；
D. welding rod uses tungsten argon arc welding rod, diameter 2-10mm；
E. TIG Welding Machine, its power type is straight polarity direct current, welding current 75-100A, arc voltage 12-14V, shield gas flow rate 8-10L/min；
F. carry out high-frequency arc strike, molten bath is guided into mother metal thicker part, be then gradually reduced molten bath slowly blow-out, finally close protective gas；
G. annealing after welding, rate of cooling is 80-150 DEG C/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510049357.3A CN105983766A (en) | 2015-01-31 | 2015-01-31 | Low-carbon steel and alloy steel welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510049357.3A CN105983766A (en) | 2015-01-31 | 2015-01-31 | Low-carbon steel and alloy steel welding method |
Publications (1)
| Publication Number | Publication Date |
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| CN105983766A true CN105983766A (en) | 2016-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510049357.3A Pending CN105983766A (en) | 2015-01-31 | 2015-01-31 | Low-carbon steel and alloy steel welding method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107234337A (en) * | 2017-06-27 | 2017-10-10 | 包头钢铁（集团）有限责任公司 | A kind of method of laser welder mild steel |
| CN108127226A (en) * | 2017-12-26 | 2018-06-08 | 重庆安特管业有限公司 | A kind of welding method of mild steel and stainless steel |
| CN108941849A (en) * | 2017-05-26 | 2018-12-07 | 河南省森德隆能源装备再制造有限公司 | It relates to exchanger tubes and tubesheets weld seam in sulphur heat exchanger and reveals renovation technique |
| CN114603234A (en) * | 2022-04-02 | 2022-06-10 | 鲁西工业装备有限公司 | Method for welding 42CrMo alloy steel and low-carbon steel dissimilar steel |
-
2015
- 2015-01-31 CN CN201510049357.3A patent/CN105983766A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108941849A (en) * | 2017-05-26 | 2018-12-07 | 河南省森德隆能源装备再制造有限公司 | It relates to exchanger tubes and tubesheets weld seam in sulphur heat exchanger and reveals renovation technique |
| CN107234337A (en) * | 2017-06-27 | 2017-10-10 | 包头钢铁（集团）有限责任公司 | A kind of method of laser welder mild steel |
| CN107234337B (en) * | 2017-06-27 | 2019-03-29 | 包头钢铁（集团）有限责任公司 | A kind of method of laser welder mild steel |
| CN108127226A (en) * | 2017-12-26 | 2018-06-08 | 重庆安特管业有限公司 | A kind of welding method of mild steel and stainless steel |
| CN114603234A (en) * | 2022-04-02 | 2022-06-10 | 鲁西工业装备有限公司 | Method for welding 42CrMo alloy steel and low-carbon steel dissimilar steel |
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Application publication date: 20161005 |