CN103994302A - Gas pipeline blank repairing, welding and strengthening method - Google Patents

Abstract

The invention relates to the field of gas pipeline welding and strengthening, in particular to a gas pipeline blank repairing, welding and strengthening method to solve the problems that when a system is stopped for handling gas pipeline leakage, time and energy are consumed, operation is complex, personal safety is threatened, and the environment is polluted due to gas diffusion. The blank repairing and strengthening technology is obtained according to the metal welding performance and plasticity and gas pipeline leaking stoppage tests performed many years, interference from gas leakage in the small welding range does not exist, and the problems of gas inflammation, explosion and poison are avoided. A welding line weak link on a welding device and a welding pipeline and a thinned part caused by long-time operation of the gas pipeline are strengthened, the method plays a role in safety production of companies, and great economic benefits and environmental protection benefits are produced.

Description

Gas pipe line is mended base reinforcement of weld method

Technical field

The present invention relates to gas pipe line reinforcement of weld field, particularly gas pipe line is mended base reinforcement of weld method.

Background technique

Coal gas spot blast furnace, converter, coke oven have larger distance apart from coal-gas recovering ground, blast furnace gas excess pressure power generating machine and gas fired boiler, and gas pipeline is arranged in the both sides of blast furnace region, coke oven region, company's visit passage and major roads substantially.In long-time running, gas pipe line is because of the wearing and tearing of weld defect, dust-laden coal gas, and since particularly three, five blast furnace dry method dusts put into operation, gas leakage phenomenon appears in pipeline acid etching.This not only threaten pedestrians personal safety, pollute surrounding environment, affect gas to generate electricity amount, especially in the winter time, also may affect surrounding area resident heat.

Summary of the invention

The technical problem that the present invention solves is: the problem of, power consumption consuming time for stop system gas treatment pipe leakage, complicated operation, threat life safety and coal gas diffusion befouling environment, the weld seam weak link occurring on the equipment that can weld, pipeline and the gas pipe line large size thinning area of causing of putting into operation is for a long time reinforced, prevent pipe leakage.

The technical solution adopted in the present invention is: gas pipe line is mended base reinforcement of weld method, carries out according to following step:

Step 1, carries out ultrasound examination to gas pipe line and finds weld seam weak part and gas pipe pipe thickness thinning area;

Step 2, butt welded seam weak part carries out repair welding: adopt material, the roughly the same sheet material of thickness and weld seam pipeline is as mending base, on the weld seam having welded, be welded with one and mend base, mend base and roll into the roll bending conforming to leakage gas Pipeline Curvature, in the time that welded pipe line is mended base, should first weld one side parallel with weld seam, after being soldered, beat gently with hand hammer while hot, making to mend the one side having welded between base and pipeline occurs local close, the adjacent both sides of again benefit base having been welded weld respectively near the part of tube wall, and then beat with hand hammer, make to mend base near pipeline, near one section, weld one section, repeatedly carry out, until while being soldered to the opposite side of weld seam, with electric arc to mending blanket preheating, and knock benefit base with hand hammer along the weld seam both sides direction parallel with weld seam while hot, make to mend base arches upward on pipe welding seam, and benefit base and the pipeline of weld seam both sides are close to, again two side welds of mending base are crossed to weld seam, and take advantage of weld seam red heat hand hammer and beat gently weld seam and mend base, make the benefit base not welding be close to pipeline, continue again welding, weld until mend base both sides, the finally welding another side parallel with weld seam, and ensure fillet weld full weld,

Step 3, repair welding is carried out in gas pipe pipe thickness thinning area: adopt the roughly the same sheet material in material, thickness and gas pipe pipe thickness thinning area as mending base, on gas pipe pipe thickness thinning area, be welded with one and mend base, mend base and roll into the roll bending conforming to gas pipe pipe thickness thinning area curvature, then repair welding is in the outside of attenuate pipeline.

The invention has the beneficial effects as follows: gas pipe line adopts mends base reinforcement technique, avoid blast furnace fault damping down repeatedly, reducing main production unit fault stops transport repeatedly, reducing supplement production factory and our factory's gas fittings fault stops transport more than ten times, produce to carry producing to create imitating for corporate security and brought into play great role, produced larger economic benefit, environmental benefit, social benefit.

Brief description of the drawings

Fig. 1 is that reverse segmentation leak stopping and sth. made by twisting pressure add the weld seam that welding forms;

Fig. 2 is the weld seam forming while normally welding;

Fig. 3 is that butt welded seam weak part of the present invention carries out repair welding schematic diagram;

Fig. 4 is the present invention carries out repair welding plan view and left view to gas pipe pipe thickness thinning area.

Embodiment

Gas pipe line is carried out to ultrasound examination and find weld seam weak part and gas pipe pipe thickness thinning area, butt welded seam weak part carries out repair welding, oppositely segmentation leak stopping and sth. made by twisting pressure add welding process has good leak stopping effect to the crackle of gas pipe line, can not can be by crackle through welding as normal welding but molten bath is very shallow when the welding of these two, the welding bead that they form, the fusion penetration forming when the normal welding of its fusion penetration ratio is much smaller, as shown in Figure 1, for oppositely segmentation leak stopping and sth. made by twisting pressure add the weld seam that welding forms, the weld seam that Fig. 2 forms when normally welding, as can be seen from the figure, shallow many of fusion penetration that the fusion penetration of the weld seam that Fig. 1 forms formed than normal when welding, therefore, the former weld strength is also poor many compared with the latter.The weld seam that this leak stopping forms is in gas pipe line actual moving process, easily because gas pressure larger fluctuation reappears crackle.Therefore the weld seam forming for leak stopping should be taked reinforcement measure effectively.As shown in Figure 3, adopt the roughly the same sheet material of material, thickness and leakage pipe as mending base, on the weld seam having welded, be welded with one and mend base, mend the size of base and determine according to actual conditions, mend the fillet weld of base surrounding and press full weld.

Mending base can extract on standard tubing, also can make of steel plate.While making benefit base with steel plate, should and roll the roll bending conforming to leakage gas Pipeline Curvature according to required benefit base size dimension.

In the time that welded pipe line is mended base, should first weld one side parallel with weld seam, after being soldered, beat gently with hand hammer while hot, making to mend the one side having welded between base and pipeline occurs local close, the adjacent both sides of again benefit base having been welded weld respectively near the part of tube wall, and then beat with hand hammer, make to mend base near pipeline, near one section, weld one section, repeatedly carry out, until while being soldered to the opposite side of leak stopping weld seam, with electric arc to mending blanket waste heat, and knock benefit base with hand hammer along the weld seam both sides direction parallel with leak stopping weld seam while hot, in time, mends base and arches upward on pipe plugging weld seam, and benefit base and the pipeline of leak stopping weld seam both sides are close to, again two side welds of mending base are crossed to leak stopping weld seam, and take advantage of weld seam red heat hand hammer and beat gently weld seam and mend base, make the benefit base not welding be close to pipeline, continue again welding, weld until mend base both sides, the finally welding another side parallel with leak stopping weld seam, and ensure fillet weld full weld.

When base is mended in welding, just welding edge has beaten two objects: make to mend base and be close to gas pipe line; Knock weld seam and can reduce welding stress, prevent weld cracking.In the time that blast furnace stop system overhauls, should and mend base by the weld seam of this class leak stopping and slice off, pipeline is thoroughly repaired.

Implement before leak stopping, safety climbing ladder must be set up in leak stopping scene, and must have 2 people to guard.

Repair welding is carried out in gas pipe pipe thickness thinning area:

Shanxi Taiyuan Iron and Steel Co. is not revised limited company's gas pipe line enormous amount, section of tubing tube wall is due to the generation worn down that puts into operation for a long time, especially since blast furnace dry method dust puts into operation, pipe thickness attenuate speed is sharply accelerated in acid etching, causes the repeatedly pipe leakage accident that occurred.Need regularly Gas Pipe Wall Thickness to be carried out to ultrasonic measurement, the pipeline that exceedes safety margin to existing carries out preventative repair welding.As shown in Figure 4, make and mend when base, according to attenuate line size specification, the roll bending that preparation conforms to leakage pipe curvature several pieces, then repair welding is in the outside of attenuate pipeline.Repair welding is carried out in the thinner position of gas pipe line tube wall large size, be actually equivalent to increase pipeline wall thickness, strengthened pipeline strength, can prevent pipeline large size thinning area that leakage accident occurs.

To pipeline wall thickness large size attenuate problem, cannot stop at blast furnace system, damping down in the situation that, leak while using injecting Live leaking-stopping technology if there is this class, fixture probably even increases the weight of gas leakage by leakage pipe extrusion-deformation; Adopt adhesive technology with pressure to be also difficult to solve to this class problem, and use this method to solve cleverly.

Implement before leak stopping, safety climbing ladder must be set up in leak stopping scene.In the time possessing following condition, can carry out leak stopping: scene must have 2 people to guard; Welding personnel must wear respirator; Protection station professional workforce must await orders at the scene; Fire-fighting truck is on-the-spot to be coordinated.

Claims (1)

1. gas pipe line is mended base reinforcement of weld method, it is characterized in that carrying out according to following step:

Step 1, carries out ultrasound examination to gas pipe line and finds weld seam weak part and gas pipe pipe thickness thinning area;

Step 2, butt welded seam weak part carries out repair welding: adopt material, the roughly the same sheet material of thickness and weld seam pipeline is as mending base, on the weld seam having welded, be welded with one and mend base, mend base and roll into the roll bending conforming to leakage gas Pipeline Curvature, in the time that welded pipe line is mended base, should first weld one side parallel with weld seam, after being soldered, beat gently with hand hammer while hot, making to mend the one side having welded between base and pipeline occurs local close, the adjacent both sides of again benefit base having been welded weld respectively near the part of tube wall, and then beat with hand hammer, make to mend base near pipeline, near one section, weld one section, repeatedly carry out, until while being soldered to the opposite side of weld seam, with electric arc to mending blanket preheating, and knock benefit base with hand hammer along the weld seam both sides direction parallel with weld seam while hot, make to mend base arches upward on pipe welding seam, and benefit base and the pipeline of weld seam both sides are close to, again two side welds of mending base are crossed to weld seam, and take advantage of weld seam red heat hand hammer and beat gently weld seam and mend base, make the benefit base not welding be close to pipeline, continue again welding, weld until mend base both sides, the finally welding another side parallel with weld seam, and ensure fillet weld full weld,

Step 3, repair welding is carried out in gas pipe pipe thickness thinning area: adopt the roughly the same sheet material in material, thickness and gas pipe pipe thickness thinning area as mending base, on gas pipe pipe thickness thinning area, be welded with one and mend base, mend base and roll into the roll bending conforming to gas pipe pipe thickness thinning area curvature, then repair welding is in the outside of attenuate pipeline.