CN106493450B

CN106493450B - Cleft welding method

Info

Publication number: CN106493450B
Application number: CN201611024084.8A
Authority: CN
Inventors: 成鹏; 王纬顺; 宋丽英
Original assignee: China Huaye Group Co Ltd
Current assignee: China Huaye Group Co Ltd
Priority date: 2016-11-17
Filing date: 2016-11-17
Publication date: 2019-08-02
Anticipated expiration: 2036-11-17
Also published as: CN106493450A

Abstract

The invention discloses a kind of cleft welding methods comprising following steps: step 1, crack two sides uniform shock dot, and dot is impacted at the both ends of crack；Step 2 is cleaned at fracture, bevel, polishing, wherein the dot stays in the bevelled edge；Step 3, welding gun carries out large area preheating along crack outside in, starts to weld when reaching welding condition, and when welding, welding head is in molten bath draws a circle always, until welding terminates.The invention enables at crack two sides and both ends stress and residual stress well discharged, job costs are low, and welding effect is good, easy to operate, are not susceptible to failure, shorten the time of soldering, to ensure the orderly progress of construction.

Description

Cleft welding method

Technical field

The present invention relates to a kind of repair methods, more particularly to a kind of repair method in crack.

Background technique

In large steel structure installation work progress, all use crawler crane as lifting device substantially, crawler crane can be sling Weight walking, can satisfy construction site needs, under the inclement weather conditions sharply to cool down, easily causes crawler crane aluminum water tank Icing bursting by freezing, and traditional double V-groove welds when carrying out repair welding, since stress and residual stress do not obtain good release, leads It causes repair welding success rate low, so that the construction period is delayed, causes the loss of human and material resources, financial resources.

Crackle finally finds the impact of gas welding repair welding circular cone and U the case where original place is snapped again after inventor combines welding Type groove method, repair welding crack success rate is high, while the construction period is also ensured.

Summary of the invention

In view of the drawbacks of the prior art, it is an object of that present invention to provide a kind of job costs are low, welding effect is good, operation side Just cleft welding method.

Above-mentioned purpose of the invention is achieved through the following technical solutions:

The present invention provides a kind of cleft welding method, comprising the following steps:

Step 1, in crack two sides uniform shock dot, dot is impacted at crack both ends,

Step 2 is cleaned at fracture, bevel, polishing,

Step 3, welding gun are preheated along crack, start to weld when reaching welding condition,

Wherein, the dot of the crack two sides and the impact of crack both ends stays in the bevelled edge.

Preferably, the groove is U-shaped groove.

Preferably, the dot and crack impacted at the crack both ends is in same horizontal line.

Preferably, the step 3, welding gun carry out large area preheating along crack outside in, open when reaching welding condition Begin welding, when welding, welding head is in molten bath draws a circle always, until welding terminates.

Preferably, distance is 10 ㎜ between the ipsilateral two adjacent dots in the crack, impacts 2 ㎜ of depth of dot, respectively Dot to crack distance be 6 ㎜.

Preferably, the first dot, the second dot and third dot are impacted respectively from the near to the remote apart from crack both ends, wherein the One dot impact depth is 3mm, and the second dot impact depth is 2mm, and third dot impact depth is 1mm.

Relative to existing double V-groove weld, cleft welding method of the present invention have it is below the utility model has the advantages that

1) present invention carries out repair welding by impacting dot in crack two sides and both ends, so that around crack both sides and two-end-point Stress and residual stress well discharged, to improve the success rate of soldering.

2) the U-shaped groove of the present invention increases weld penetration, and bevelled edge fusion character is relatively good；And residual stress is also eliminated, Good success rate is provided to cleft weld.

3) welding equipment of the present invention is simple, easy to operate, and welding expense is low, it is ensured that the construction period saves man power and material

Detailed description of the invention

Fig. 1 is impact dot position schematic diagram of the invention.

Fig. 2 is diagrammatic cross-section at groove C-D in crack of the present invention.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description:

As shown in Figure 1, first at the center of 2 two sides of the crack of aluminum water tank 1 with circular cone impact two dot C1 and D1, using two dots of C1 and D1 as starting point to 2 both ends uniform shock dot C2, D2 of crack, C3, D3, C4, D4, C5, D5, C6, D6, wherein the distance between ipsilateral two neighboring dot in crack 2 is 10 ㎜, 2 ㎜ of depth of the impact dot, each dot It is 6 ㎜ to crack distance；

At 2 both ends of crack, be in same horizontal line with crack 2, with circular cone impact dot, apart from 2 both ends of crack by It is close to it is remote be the first dot A1 and B1, the second dot A2 and B2, third dot A3 and B3 respectively；Wherein, the first dot A1 and B1 From 2 nearer end point 10 of crack, impact depth is 3 ㎜, and the second dot A2 and B2 is from 2 nearer end point of crack, 16 ㎜, impact depth 2 From 2 nearer end point of crack, 19 ㎜, impact depth is 1 ㎜ by ㎜, third dot A3 and B3.

As shown in Fig. 2, outputing U-shaped groove 3, groove on 1 crack 2 of aluminum water tank according to 2 mother metal thickness of crack and size 3 depth are 3 ㎜, are then polished；The impact dot of 2 two sides of crack stays on the edge of U-shaped groove 3, and the of 2 both ends of crack One dot A1 and B1, the second dot A2 and B2, third dot A3 and B3 are also stayed on the edge of U-shaped groove 3.

Further, welding gun carries out large area preheating along the 200 ㎜ outside in nearby of crack 2, so that on temperature is quick It rises.When crack, 2 surface color slightly changes, and becomes Dark grey or fold when fusing point, and welding wire thawing drops onto weldering Formation pelletizing shape on U-shaped 3 surface of groove is stitched, welding base metal fusing degree is melted to, basically reaches welding condition.

Further, when welding, welding gun along welding direction to opposite direction tilt 45° angle, welding wire along welding direction just Direction tilts 30 ° of angles, and welding gun has moved quickly into solder joint, and welding wire is also tightly kept up with, and welding wire is in always among flame protection, prevents Only welding wire is leaked cruelly and is oxidized in air, is brought excessive impurity to weld seam, is caused welding defect.

Welding wire is added in impact dot fusing at 2 endpoint of crack at any time, and weld width is more than 2 liang of crack side impact dot, Welding gun is mobile to welding direction, and welding head is in molten bath draws a circle always, plays stirring action, have the impurity in molten bath and fill Face of weld is overflowed between timesharing, stirring of drawing a circle, which will remain to welding, to be terminated, and it is more than 2 ㎜ of base material that molten bath is controlled in welding process, is received Welding wire has to fill up arc crater when arc.

Repair method of the invention is suitable for the various materials such as aluminum, copper, cast steel and gray cast iron and carries out crack repair welding, And the number for impacting dot can be arranged according to soldering component size.

In conclusion the present invention by the cleft welding method that repair welding circular cone impacts dot and U-shaped groove make work at This is low, and welding effect is good, and easy to operate, is not susceptible to failure, shortens the time of soldering, to ensure the orderly of construction It carries out.

The preferred embodiment of the present invention is described in conjunction with attached drawing above, but the invention is not limited to above-mentioned specific Embodiment, the above mentioned embodiment is only schematical, is not restrictive, those skilled in the art Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very Multi-form, these all fall within the protection scope of the present invention.

Claims

1. a kind of cleft welding method, which comprises the following steps:

Step 2 is cleaned at fracture, opens U-shaped groove, is polished,

Step 3, welding gun are preheated along crack outside in, when fracture faces color becomes Dark grey, wire melting drop Formation pelletizing shape on the U-shaped groove face of weld seam is fallen on, welding base metal fusing degree is melted to, starts to weld when reaching welding condition It connects,

When welding, welding gun tilts 45° angle to opposite direction along welding direction, and welding wire tilts 30 ° of angles along welding direction positive direction, Welding gun has been moved to solder joint, and welding wire keeps up with and is in flame always；Impact dot fusing addition weldering at any time at the endpoint of crack Silk, weld width are more than the impact dot of crack two sides, and welding gun is mobile to welding direction, and welding head is in molten bath draws always Enclosing and remaining to welding terminates, and it is more than 2 ㎜ of base material that molten bath is controlled in welding process, and welding wire fills up arc crater when receiving arc；

2. cleft welding method according to claim 1, which is characterized in that at the crack both ends impact dot with split Seam is in same horizontal line.

3. cleft welding method according to claim 1, which is characterized in that the ipsilateral two adjacent dots in crack it Between distance be 10 ㎜, impact 2 ㎜ of depth of dot, each dot to crack distance is 6 ㎜.

4. cleft welding method according to claim 1, which is characterized in that impacted respectively from the near to the remote apart from crack both ends First dot, the second dot and third dot, wherein the first dot impact depth is 3mm, the second dot impact depth is 2mm, Third dot impact depth is 1mm.