CN100531992C - Heterogeneous welding line arc cold welding process for removing chilling annealing using cast iron - Google Patents
Heterogeneous welding line arc cold welding process for removing chilling annealing using cast iron Download PDFInfo
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- CN100531992C CN100531992C CNB2005100437071A CN200510043707A CN100531992C CN 100531992 C CN100531992 C CN 100531992C CN B2005100437071 A CNB2005100437071 A CN B2005100437071A CN 200510043707 A CN200510043707 A CN 200510043707A CN 100531992 C CN100531992 C CN 100531992C
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Abstract
The invention discloses a heterogeneous brazing seam electric arc cold welding process. It solves problems in current gray casting heterogeneous brazing seam electric arc cold welding process of white and hard tissue, high hardness in bond, hard mechanical process, high possibility of crack generation after welding, and so on. The process comprises: a. eliminating white annealing; b. cooling casting in furnace to normal temperature; c. welding casting under normal temperature.
Description
Technical field
The present invention relates to a kind of grey cast-iron welding procedure, relate in particular to a kind of cast iron that utilizes and eliminate air chill annealing back employing heterogeneous welding line arc cold welding process.
Background technology
An ash mouthful foundry goods is welded with homogeneity weld seam electric arc hot welding and heterogeneous welding line arc cold welding process at present.Homogeneity weld seam electric arc hot welding is meant foundry goods is heated to 600～700 ℃ of welding, the technology of postheating.Hot welding postwelding casting stress is little, the fusion area chilling tendency is little, Weld Performance and mother metal basically identical, but has the high and workman's working condition difference problem of welding rod price of making, so, adopt homogeneity weld seam hot welding less at present.
Heterogeneous sea welding (is example with the EZNiFe welding rod) arc cold-welding technology is meant that employing and mother metal composition are inconsistent, the technology that foundry goods at room temperature welds.Its advantage is that foundry goods does not need heating, the saving energy and workman's working condition good.But the deficiency of its existence is to weld back stress big (casting stress and welding stress stack), and the fusion area tissue is difficult to avoid spoken parts in traditional operas and crisp sclerous tissues, fusion area hardness height, and the machining difficulty, the welding process requirement strictness cracks the tendency height after the welding.
It is more that the grey cast-iron welding wishes that tissue obtains the good ferritic structure of plasticity, there is not hard crisp tissue, casting stress and welding stress are the smaller the better, just guarantee the quality of foundry goods weld seam under such condition easily, the good problem of spoken parts in traditional operas, crackle and machining property do not occur.
Summary of the invention
The present invention is exactly in order to address the above problem, before the heterogeneous welding line arc cold welding process welding, utilize the big foundry goods of centering to eliminate the advantage of air chill annealing, matrix obtains the good ferritic structure of 80% left and right sides plasticity, stress in the foundry goods is eliminated substantially, thereby obviously reduced cast iron weld crack tendency.
For achieving the above object, the present invention has adopted following technical scheme: a kind of heterogeneous welding line arc cold welding process that utilizes cast iron to eliminate air chill annealing, its step are that a. eliminates air chill annealing to cast iron; B. with cast iron with the stove cool to room temperature; C. foundry goods is at room temperature welded.
Among the described step a, eliminating the air chill annealing process is at first foundry goods to be heated to 800-900 ℃ with heating furnace; Secondly determine that according to the thickness of foundry goods temperature retention time is incubated; C. after temperature retention time arrives, with the stove cool to room temperature.
The welding method of described step c is, adopts SMAW, and the section of weak point is intermittently welded, and electric current is moderate during welding, and welding rod is not laterally swung, and answers rapid welding for preventing the fusion area air chill; Treat the weld seam cool to room temperature when welding next bar weld seam.
Described short section intermittently is welded as every fusion length below 40mm, adopts intermittently welding; Welding current is 90-110A, and speed of welding is 180mm/min.
Grey cast-iron is eliminated air chill annealing heterogeneous welding line arc cold welding process and is meant cast iron after eliminating spoken parts in traditional operas annealing, the technology of heterogeneous welding line arc cold welding at room temperature, and it has solved following problem:
1. without big foundry goods tissue in the air chill annealing, the surface has spoken parts in traditional operas, pearlite to have the carbamate additives for low phosphorus eutectic structure sometimes, tissue more than having eliminated after the air chill annealing, obtained nearly 80% the good ferritic structure of plasticity, fusion area, welding back obtains pearlite and a spot of martensitic structure easily, can obtain white structure hardly, avoid the postwelding can not processing problems.
2. through big foundry goods in the air chill annealing, casting stress is little, and the stress after the welding is little, so the tendency that cracks is also little.
3. the technology of heterogeneous welding line arc cold welding, every section of the weld seam of welding is all little, and postwelding needs immediately that butt welded seam knocks, and the stress of foundry goods little needs of air chill annealing own knocks, and simplified technology.
Air chill annealing along with in big cast casting technology carry out, do not need to carry out again separately air chill annealing, so energy savings.
5. grey cast-iron is eliminated air chill annealing heterogeneous welding line arc cold welding process and is had hot weld and spoken parts in traditional operas and the little advantage of stress do not occur, and the good advantage of cold welding workman working condition is also arranged
The specific embodiment
The present invention proposes a kind of heterogeneous welding line arc cold welding process that utilizes cast iron to eliminate air chill annealing, it has the following steps,
A. cast iron is eliminated air chill annealing, it is that foundry goods is heated to 800-900 ℃ with heating furnace, is preferably 800-860 ℃, then foundry goods is incubated, and temperature retention time is decided according to the wall thickness of foundry goods and the complexity of structure;
B. after the temperature retention time that reaches setting, with cast iron with the stove cool to room temperature;
C. foundry goods is at room temperature welded.Heterogeneous welding line arc cold welding process is adopted in welding, adopts SMAW when welding, and welding rod is the EZNiFe type, and its diameter 3.2mm uses direct current or AC welding set, welding current 90～110A, speed of welding 180mm/min; Treat the weld seam cool to room temperature when welding following one weld seam.Below every fusion length 40mm, interrupted welding prevents to enter weld seam because of the heat input too much makes graphite decompose, and welding rod is not done teeter, and the composition in the control mother metal is added in the weld seam, prevents that air chill from appearring in the fusion area.
Claims (2)
1. one kind is utilized cast iron to eliminate the heterogeneous welding line arc cold welding process that air chill is annealed, and it is characterized in that: its step is:
A. cast iron is eliminated air chill annealing, elimination air chill annealing process is: at first ironcasting is heated to 800-900 ℃ with heating furnace; Secondly, determine that according to the thickness of foundry goods temperature retention time is incubated;
B. after temperature retention time arrived, foundry goods was with the stove cool to room temperature;
C. foundry goods is at room temperature welded, the method for welding is: adopt the conventional SMAW of non-cast iron, the interrupted welding of the section of weak point, electric current is moderate during welding, and welding rod is not laterally swung, for preventing the fusion area spoken parts in traditional operas, answer rapid welding, when welding next bar weld seam, need treat welding line cool to room temperature.
2. the heterogeneous welding line arc cold welding process that utilizes cast iron to eliminate air chill annealing according to claim 1 is characterized in that: described short section intermittently is welded as: every fusion length adopts intermittently welding below 40mm; Welding current is 90-110A, and speed of welding is 180mm/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100437071A CN100531992C (en) | 2005-06-07 | 2005-06-07 | Heterogeneous welding line arc cold welding process for removing chilling annealing using cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100437071A CN100531992C (en) | 2005-06-07 | 2005-06-07 | Heterogeneous welding line arc cold welding process for removing chilling annealing using cast iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1876305A CN1876305A (en) | 2006-12-13 |
| CN100531992C true CN100531992C (en) | 2009-08-26 |
Family
ID=37508957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100437071A Expired - Fee Related CN100531992C (en) | 2005-06-07 | 2005-06-07 | Heterogeneous welding line arc cold welding process for removing chilling annealing using cast iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100531992C (en) |
-
2005
- 2005-06-07 CN CNB2005100437071A patent/CN100531992C/en not_active Expired - Fee Related
Non-Patent Citations (4)
| Title |
|---|
| HT250灰口铸铁的退火工艺和性能试验. 王国凡，汤爱君，景财年等.金属热处理，第29卷第9期. 2004 |
| HT250灰口铸铁的退火工艺和性能试验. 王国凡，汤爱君，景财年等.金属热处理，第29卷第9期. 2004 * |
| 高精度灰铸铁缸套的焊补. 王国凡，刘广中，李向阳等.新技术新工艺，第2004年第10期. 2004 |
| 高精度灰铸铁缸套的焊补. 王国凡，刘广中，李向阳等.新技术新工艺，第2004年第10期. 2004 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1876305A (en) | 2006-12-13 |
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Granted publication date: 20090826 Termination date: 20110607 |