CN101524787B - Method for welding crack of workpiece - Google Patents
Method for welding crack of workpiece Download PDFInfo
- Publication number
- CN101524787B CN101524787B CN2009100970350A CN200910097035A CN101524787B CN 101524787 B CN101524787 B CN 101524787B CN 2009100970350 A CN2009100970350 A CN 2009100970350A CN 200910097035 A CN200910097035 A CN 200910097035A CN 101524787 B CN101524787 B CN 101524787B
- Authority
- CN
- China
- Prior art keywords
- welding
- workpiece
- crack
- repair
- weld seam
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
A method for welding a crack of a workpiece is characterized in that the method comprises the following steps (1) cutting a crack region of the workpiece and grinding a welding line along the trend of the crack; (2) placing a metal strip dimensionally matched with the welding line at the bottom part of the welding line (the bottom part of the metal strip covers the crack); (3) welding two seams formed between the outer wall of the metal strip and the side wall of the welding line, in the premise that the metal strip can not be penetrated; and (4) filling filler metal in the whole welding line to complete the abutting joint of the welding line. Compared with the prior art, the metal strip is covered on the crack before welding is carried out, and the outer wall of the metal strip and the side wall of the welding line positioned in the crack region are welded so as to separate the crack from a weld pool, and enable welding stress to be distributed on two bending seams with top ends being closed on two sides of the metal strip. The welding stress previously concentrates on a straight seam positioned in the center of the crack. The invention solves the problem that the stress concentrates in the crack when the weld pool solidifies.
Description
Technical field
The present invention relates to a kind of repair method, particularly a kind ofly can effectively avoid workpiece the surface produces the repair welding technique of secondary cracks because stress is concentrated after welding.
Background technology
Mould at formed product or iron and steel parts in use, because the rigidity of workpiece own is bigger, add heat treatment or weld reasons such as improper, make the local stress of workpiece be easy to produce local defect too greatly, generation as crackle, the existence of this crackle can cause the defective of product, when serious whole work-piece is scrapped, and has influence on the security that complete machine uses.And similar situation also is present in the workpiece with inserts, because inserts connects the existence of seam, also can have influence on the performance of product.
Usually, the methods of directly crackle being welded that adopt are carried out Repair Welding to workpiece more in the prior art, as application number is that 93104019.1 Chinese invention patent " the local repair method of tungsten gold cover of fluid friction bearing " comes off to the tungsten gold with gas welding torch and toasts preheating through the position of cleaning, and carries out strip repair welding method then; And for example application number is that CN200710044529.3 Chinese invention patent " repair method of ironcasting " then polish groove with the section of this ironcasting earlier, and preheating is carried out at the position of pre-welding, welds with welding rod then.But, adopt the repair welding technique in the above-mentioned patent can produce the seam that condenses on the surface of workpiece crack at postwelding, this seam that condenses makes the crackle of workpiece at original defectiveness position can continue to extend, thereby produces secondary cracks.Solidify because can arrange in turn to the center from the both sides foundation respectively along stress direction during at condensation-crystallization when the metal in the welding pool, original workpiece crack center is exactly the maximum point of stress, this situation exists all the time at postwelding, if the thermal contraction little or welding material of welding pool volume is little, the seam that condenses is just little, otherwise, the seam that condenses is just big, though weld seam is through tens layers fusing and solidify, the defective that produces secondary cracks but the stress that stitches because condense is concentrated still exists, though all workpiece is preheated in the above-mentioned patent, can reduce the influence of thermal stress, but preheat the thermal deformation that causes one-piece machine member easily, and be difficult to fundamentally solve the problem of condensing seam.
So, also someone's method of having adopted other is to prevent to produce after the soldering problem of secondary cracks, as the patent No. is that " crack welding and repairing process of ferrous metal parts " Chinese invention patent of 00120516.1 discloses following processing step, comprise pre-welding treatment, gradation filler metal after the first segmentation in cracked zone, mainly each filler metal is implemented mechanical hammering, eliminate its cooling by distortion and shrink the tension that forms, and be the compression that next filler metal presets surface to be welded, to the welding repair process of finishing crackle.But, the whole welding repair process of this patented method need melt to fill out with the hammering metal and repeatedly hocket, and behind each filler metal, all need carry out mechanical hammering to metal surface to be welded and adjacent metal matrix according to certain frequency, comparatively waste time and energy, process is loaded down with trivial details relatively.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of technical process simple and can avoid when weld pool solidifies stress to concentrate the repair welding technique of defective at above-mentioned prior art present situation, adopts the secondary cracks that can effectively eliminate workpiece behind this repair welding technique.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: the repair welding technique of this workpiece crack, it is characterized in that, and include following processing step:
(1), the slit region to workpiece cuts earlier, grinds weld seam along this crack orientation then;
(2), place one and the suitable bonding jumper of this weld seam size in described weld seam bottom, the bottom cover of described bonding jumper is lived described crackle;
(3), described bonding jumper not by the prerequisite of penetration under, two seams that the sidewall of the outer wall of described bonding jumper and described weld seam forms are each other carried out welding;
(4), benefit expires filler metal in whole welding line, finishes the butt joint of weld seam.
In order to improve the quality of postwelding workpiece, can also the after welding treatment of carrying out after the welding be in particular, described step (4) can also include following steps afterwards: (5), after welding treatment: remove sweating heat stress, and weld grinding is smooth.
To the relatively poor workpiece of indivedual welding performances,, can also between described step (3) and step (4), increase following steps: (3-1), described workpiece is preheated in order to improve welding quality.
In order to guarantee the uniformity of postwelding workpiece before planform and rigidity and weldering, as preferably, the bonding jumper in the described step (2) can be the identical welding rod of basic material of material and described workpiece.
As preferably, in described step (3), can adopt welding repair machine to realize the welding of described bonding jumper and weld seam.
The kind of welding repair machine can according to when welding different workpieces requirement and condition of work select, common ground, described welding repair machine is argon arc welding machine or electric welding machine or cold welding machine.
Compared with prior art, the invention has the advantages that: avoided original welding stress to concentrate on the crackle and then produce the defective of secondary cracks, process of the present invention covers a bonding jumper on the crackle before soldering, only the surface contact between the outer wall of bonding jumper and the crackle opening, do not carry out welding between crackle itself and the bonding jumper, but carry out welding each other with the weld seam sidewall that is positioned at cracked zone, thereby crackle and molten bath are isolated by bonding jumper by outer wall with bonding jumper; Because bonding jumper is that two sidewalls of while and weld seam are contacted respectively, welding stress after the welding becomes by originally concentrating on the vertical masonry joint that is positioned at Crack Center and is distributed in nonopen curved the sewing in two tops that are positioned at the bonding jumper both sides, the problem of having concentrated at cracks stress when having solved weld pool solidifies, eliminate the defective that produces secondary cracks on the postwelding workpiece, guaranteed the quality of soldering.
Description of drawings
Fig. 1 has the Workpiece structure schematic diagram of crackle for the embodiment of the invention.
Fig. 2 is the partial enlarged drawing of I shown in Figure 1 portion.
The specific embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
As shown in Figure 1 and Figure 2, structural representation for the embodiment of the invention, workpiece 1 among this embodiment is that a diameter 80mm, long 40mm and material are the cylinder (referring to Fig. 1) of No. 45 carbon steels, the crackle 11 that has a radially dark 15mm on this cylindrical workpiece 1, cracked zone prolong and the axial direction of whole cylindrical workpiece 1;
So the present invention adopts the soldering of following steps realization to this cylindrical workpiece 1 crackle:
(1), the slit region of cylindrical workpiece 1 is cut, grind a dark 5mm, mouthful wide be the weld seam 2 of 5mm with emery wheel along the axial crack district direction of this cylindrical workpiece 1, and the bottom of this weld seam 2 is the circular arc that radius is 1mm;
(2), place in weld seam 2 bottoms one and the suitable diameter 1.6mm welding rod of this weld seam 2 bottom circular arcs sizes as isolating the bonding jumper 3 that crackle contacts with the molten bath, the bottom of this bonding jumper 3 just in time covers the crackle 11 of cylindrical workpiece 1, simultaneously, the both sides of bonding jumper 3 offset with the sidewall of weld seam 2 respectively;
(3), two seams that the sidewall of the outer wall of bonding jumper 3 and weld seam 2 is formed are each other carried out welding with welding repair machine (can be argon arc welding machine or electric welding machine or cold welding machine), form two nonopen curved seams 4 in top after the welding, wherein, welding repair machine in the fusion process should adopt the small-power welding, to guarantee that the bonding jumper 3 after welding finishes can not be by penetration;
(4), at normal temperatures, opening with accurate high grade energy welding assisting vehicle (cold welding machine) butt welded seam 2 of YJHB-1 type welds, in weld seam 2, mend the height of expiring filler metal and exceeding weld seam, wherein, the filler metal material of the H08Mn2Si welding wire that present embodiment has adopted diameter 1mm during as welding, weld molten the filling out of finishing whole welding line 2 pits by 10 layers of accumulation, molten referring to Fig. 2.
If the crack site of workpiece is stressed bigger, then can grind weld seam 2 more deeply, increasing the thickness of weld layer, thus can improve welding should in problem.
In the present embodiment, what butt welded seam 2 molten welding processes of filling out were used is the accurate high grade energy welding assisting vehicle (cold welding machine) of YJHB-1 type, the characteristics of this precision high grade energy welding assisting vehicle are solder joint fusings and to solidify be that (welding current is 150A in moment, weld time is 30ms) in finish, single solder joint molten metal is few, and the thermal stress in molten bath is also little.
Therefore, workpiece does not generate heat substantially when adopting this accurate high grade energy welding assisting vehicle to weld, the thermal stress of whole workpiece is almost nil, reduced to be input to the heat of workpiece, the stress of whole workpiece distortion reduces, guarantee not produce new area of stress concentration, make the workpiece of most of material can finish soldering at normal temperatures, do not need to remove the after welding treatment of thermal stress after the welding substantially yet, directly the workpiece to postwelding carries out sanding and polishing in the commissure, can find that the workpiece after the soldering is checked with the method for magnetic flaw detection by this method, (position that originally had crackle) locates not find minute crack at the weld seam center.For the relatively poor workpiece of indivedual welding performances, also can before welded seam, increase the step of workpiece preheating, to guarantee the quality of welding.
Repair method of the present invention has blocked workpiece crack with the shielded metal bar, in fusion process, make crackle and molten bath separate, thereby making original stress concentrate on a vertical masonry joint becomes on the nonopen curved seam 4 in two tops that are distributed in the weld seam both sides, the problem that stress is concentrated when having solved weld pool solidifies, avoided producing the defective of condensing seam (crackle), improved welding performance at face of weld.
Claims (6)
1. the repair welding technique of a workpiece crack is characterized in that, includes following processing step:
(1), the slit region to workpiece cuts earlier, grinds weld seam along this crack orientation then;
(2), place one and the suitable bonding jumper of this weld seam size in described weld seam bottom, the bottom cover of described bonding jumper is lived described crackle;
(3), described bonding jumper not by the prerequisite of penetration under, two seams that the sidewall of the outer wall of described bonding jumper and described weld seam forms are each other carried out welding;
(4), benefit expires filler metal in whole welding line, finishes the butt joint of weld seam.
2. the repair welding technique of workpiece crack according to claim 1, it is characterized in that: described step (4) also includes following steps afterwards:
(5), after welding treatment: remove sweating heat stress, and weld grinding is smooth.
3. the repair welding technique of workpiece crack according to claim 1 is characterized in that: increase following steps between described step (3) and the step (4):
(3-1), described workpiece is preheated.
4. according to the repair welding technique of claim 1 or 2 or 3 described workpiece cracks, it is characterized in that: the bonding jumper in the described step (2) is the identical welding rod of basic material of material and described workpiece.
5. according to the repair welding technique of claim 1 or 2 or 3 described workpiece cracks, it is characterized in that: in described step (3), adopt welding repair machine to realize the welding of described bonding jumper and weld seam.
6. the repair welding technique of workpiece crack according to claim 5, it is characterized in that: described welding repair machine is argon arc welding machine or electric welding machine or cold welding machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100970350A CN101524787B (en) | 2009-03-27 | 2009-03-27 | Method for welding crack of workpiece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100970350A CN101524787B (en) | 2009-03-27 | 2009-03-27 | Method for welding crack of workpiece |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101524787A CN101524787A (en) | 2009-09-09 |
| CN101524787B true CN101524787B (en) | 2011-01-05 |
Family
ID=41092941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100970350A Expired - Fee Related CN101524787B (en) | 2009-03-27 | 2009-03-27 | Method for welding crack of workpiece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101524787B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102366859A (en) * | 2011-08-08 | 2012-03-07 | 北京天恒成工业技术有限公司 | Repair welding regeneration technology for manipulator of multifunctional furnace |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104646910A (en) * | 2014-06-14 | 2015-05-27 | 卢丽 | Pressing roller shaft journal abrasion repairing method |
| CN105499276A (en) * | 2014-09-24 | 2016-04-20 | 上海宝钢工业技术服务有限公司 | Repair method for flat head cracks of working roll of rolling mill R1 |
-
2009
- 2009-03-27 CN CN2009100970350A patent/CN101524787B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102366859A (en) * | 2011-08-08 | 2012-03-07 | 北京天恒成工业技术有限公司 | Repair welding regeneration technology for manipulator of multifunctional furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101524787A (en) | 2009-09-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101543926B (en) | Overlaying welding technology of ductile cast iron roller | |
| CN105127562B (en) | Method for welding welded joint between stainless steel composite plate and austenitic stainless steel | |
| CN105127566B (en) | The complete penetraction and fusion in welding welding method of big thickness carbon steel stainless steel clad plate | |
| CN103706921B (en) | Hot-rolling finishing mill backing roll build-up welding repair method | |
| CN101143402A (en) | Screw plunger welding composite connecting method for adhesive joint repair | |
| CN107335939A (en) | The big thickness Bead weld repair layer of large-scale 70Cr3Mo backing rolls and renovation technique | |
| CN101138819A (en) | High-hardness high carbon alloy hammered steel roll set composite manufacturing technology | |
| CN101524787B (en) | Method for welding crack of workpiece | |
| CN105598596A (en) | Non-preheating combined welding method of 1200MPa high-strength steel | |
| CN112439972A (en) | Welding method for solving out-of-tolerance problem of crack arrest steel butt welding groove gap | |
| CN101559549A (en) | Process method for rewelding of high strength steel | |
| CN100463768C (en) | Welding technology for broken and waste core rod | |
| CN102922087A (en) | Welding repair method of defects after precision processing of large-scale carbon steel casting | |
| CN112453656A (en) | Welding method of thin-wall thick high-strength steel plate | |
| CN114406512B (en) | Welding and electric pulse heat treatment process for dissimilar alloy | |
| CN102950363A (en) | Overlaying repair process for winch drum | |
| CN110747462A (en) | High-speed laser cladding process | |
| CN102837116A (en) | Overlaying welding repairing technology of stainless steel cold-rolled bearing roller | |
| CN101704162B (en) | Electroslag welding method for cylindrical longitudinal seam V groove | |
| CN101439434B (en) | High intensity alloyed steel traction pin and welding process of foundation | |
| CN116117298A (en) | Method for repairing copper-steel electron beam welding seam defect | |
| CN111843111B (en) | Wear-resistant metal composite plate and manufacturing method thereof | |
| CN109848543A (en) | A kind of method of mixing yoghurt prevention aluminium alloy angle joint lamellar tearing | |
| CN106425277A (en) | Repairing method for electroslag welding weld defect of box type structural steel | |
| CN113070548A (en) | Anti-cracking welding method for welding seam |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110105 Termination date: 20140327 |