阅读说明：本技术 一种用于管道环焊缝的焊接清渣剂及其制备方法和应用 (Welding slag remover for pipeline circumferential weld and preparation method and application thereof ) 是由 陈浮 黄治军 崔雷 于 2021-08-30 设计创作，主要内容包括：本发明公开了一种用于管道环焊缝的焊接清渣剂,各组分及其所占质量百分比为：碳酸氢镁3～7％,长石9～11％,乙基羟乙基纤维素1～9％,钼酸盐0.5～6.5％,一元醇5～11％,剩余为水。本发明所述焊接清渣剂易于现场焊接操作,具有良好的耐热性,焊接完毕后自然挥发,无需专门清除,不影响焊接接头性能及后续涂装工艺,并有助于提升焊接电弧稳定性,提高焊缝质量；且涉及的制备方法简单、成本较低,适合推广应用。(The invention discloses a welding slag remover for a pipeline circumferential weld, which comprises the following components in percentage by mass: 3-7% of magnesium bicarbonate, 9-11% of feldspar, 1-9% of ethyl hydroxyethyl cellulose, 0.5-6.5% of molybdate, 5-11% of monohydric alcohol and the balance of water. The welding slag remover disclosed by the invention is easy for field welding operation, has good heat resistance, naturally volatilizes after welding, does not need special removal, does not influence the performance of a welding joint and a subsequent coating process, and is beneficial to improving the stability of a welding arc and improving the quality of a welding seam; and the related preparation method is simple, has low cost and is suitable for popularization and application.)

1. The welding slag remover for the pipeline circumferential weld is characterized by comprising the following components in percentage by mass: 3-7% of magnesium bicarbonate, 9-11% of feldspar, 1-9% of ethyl hydroxyethyl cellulose, 0.5-6.5% of molybdate, 5-11% of monohydric alcohol and the balance of water.

2. The welding slag remover according to claim 1, wherein the molybdate is magnesium molybdate, ammonium molybdate or an alkali metal-based molybdate.

3. The welding slag remover according to claim 1, wherein the monohydric alcohol is one or more of n-butanol, isobutanol or neopentyl alcohol.

4. The welding slag remover according to claim 1, wherein the particle size of the feldspar is 10 μm or less.

5. The preparation method of the welding slag remover for the pipe circumferential weld according to any one of claims 1 to 4, characterized by comprising the following steps:

1) weighing the raw materials according to the mixture ratio, wherein the raw materials comprise the following components in percentage by mass: 3-7% of magnesium bicarbonate, 9-11% of feldspar, 1-9% of ethyl hydroxyethyl cellulose, 0.5-6.5% of molybdate, 5-11% of monohydric alcohol and the balance of water;

2) and uniformly mixing the weighed raw materials to obtain the welding slag remover for the pipeline circumferential weld.

6. The application method of the welding slag remover for the pipe circumferential weld according to any one of claims 1 to 4 is characterized by comprising the following steps: and spraying the welding anti-splashing liquid to the welding area and the welding groove part, and carrying out welding construction after the water stain disappears.

7. The application method according to claim 1, wherein the welding spatter preventing liquid is sprayed to the range of 100mm on both sides of the welding groove.

8. The application method of claim 1, wherein the obtained welding spatter-proof liquid is further coated inside and outside a contact tip and a nozzle of a gas shielded welding gun.

Technical Field

The invention belongs to the technical field of functional materials and welding, and particularly relates to a welding slag remover for a pipeline circumferential weld, and a preparation method and application thereof.

Background

The oil gas long-distance pipeline develops towards the direction of higher strength and larger caliber more and more, and the quality of welding quality is the key for influencing the operation of the pipeline. The pipeline on-site circumferential weld welding method mainly comprises manual electric arc welding, flux-cored wire semi-automatic welding, full-automatic gas shielded welding and the like. In recent years, these three welding materials account for about 80% of the total production of welding materials, and these three welding methods are also the main welding materials that generate welding spatter. How to reduce or even eliminate the adverse effect of welding spatter from the aspects of materials, equipment, processes and the like is one of the important difficulties to be solved in the welding field.

The welding spatter is mainly caused by the explosion of the liquid bridge due to the gasification of the liquid bridge caused by the rapid heating of the short-circuit current to the liquid bridge when the short-circuit liquid bridge is shrunk to be thinner. In the welding process, splashing can be caused by metallurgical reaction, extreme pressure, droplet short circuit, non-axial droplet transition and improper welding parameter matching. The splashing can seriously affect the appearance quality of welding, occupy a large amount of grinding time, damage a welding tool and cause adverse effects on the subsequent flaw detection process, the coating process and the quality. The traditional method for eliminating spatter in the welding field mainly depends on manual grinding, and adopts a handheld grinder to grind the spatter on the surface of the pipeline. The operation environment is severe for operators, not only is heavy labor done, but also is damaged by a large amount of metal dust, and the metal dust remains in a construction site and causes damage to the natural environment to different degrees. And the quality of manual polishing can not be guaranteed, mechanical damage to the surface of the pipeline can be caused by improper operation, adverse effects are caused to subsequent detection and coating, and potential safety hazards are brought to the operation of the pipeline seriously.

In recent years, a lot of welding spatter-proof agents have appeared, for example, patent "a welding spatter-proof agent for alloy steel plate and a preparation method thereof", CN104057215A discloses a welding spatter-proof agent for galvanized steel plate and a preparation method thereof, which are characterized in that the original welding process and mechanical properties are not changed, and a spatter-free effect is achieved. However, the invention belongs to an oil-based type, mechanical oil is used as an organic solvent, the mechanical oil is not easy to remove in-situ operation after being coated on the surface of a workpiece, the subsequent pretreatment of coating can be influenced, and the components contain lead and toluene substances harmful to human bodies. And the components are many, the process is complicated, and the use cost is high. The patent "welding spatter-proof liquid", CN101386716A, discloses a welding spatter-proof liquid for preventing a welding material ball formed by spattering from adhering to a welded product during welding, which has good removability, but in the use process of the invention, a large amount of gas can be generated, and particularly in the welding area, the probability of generating a gas hole defect in the welding seam can be increased.

Therefore, the slag remover which is economic and environment-friendly and is suitable for pipeline girth welding is further explored and optimized, and the slag remover has important research and application significance.

Disclosure of Invention

The invention mainly aims to provide the slag remover suitable for the pipeline girth welding aiming at the defects in the prior art, the slag remover has the advantages of environment-friendly, safe, economical and simple components, easy field welding operation, good heat resistance, natural volatilization after welding, no need of special removal, no influence on the performance of a welding joint and a subsequent coating process, contribution to improving the stability of a welding arc and improving the quality of a welding seam.

In order to realize the scheme, the technical scheme adopted by the invention is as follows:

a welding slag remover for a pipeline circumferential weld comprises the following components in percentage by mass: 3-7% of magnesium bicarbonate, 9-11% of feldspar, 1-9% of ethyl hydroxyethyl cellulose, 0.5-6.5% of molybdate, 5-11% of monohydric alcohol and the balance of water.

In the above scheme, the molybdate is magnesium molybdate, ammonium molybdate or alkali metal-based molybdate; wherein the alkali metal-based molybdate can be sodium molybdate.

In the scheme, the monohydric alcohol is one or more of n-butyl alcohol, isobutyl alcohol or neopentyl alcohol.

In the above aspect, the particle size of the feldspar is 10 μm or less.

The preparation method of the welding slag remover for the pipeline circumferential weld comprises the following steps:

1) weighing the raw materials according to the mixture ratio, wherein the raw materials comprise the following components in percentage by mass: 3-7% of magnesium carbonate, 9-11% of feldspar, 1-9% of ethyl hydroxyethyl cellulose, 0.5-6.5% of molybdate, 5-11% of monohydric alcohol and the balance of water;

2) and uniformly mixing the weighed raw materials to obtain the welding slag remover for the pipeline circumferential weld.

The application method of the welding slag remover for the pipeline circumferential weld comprises the following steps: and spraying the welding anti-splashing liquid to the welding area and the welding groove part, and carrying out welding construction after the water stain disappears.

Preferably, the welding anti-spattering liquid is sprayed to the range of 100mm on the two sides of the welding groove.

Preferably, the obtained welding anti-spattering liquid is further coated inside and outside the conductive nozzle and the spray pipe of the gas shielded welding gun, so that the welding gun can be effectively prevented from being blocked by spattering.

The principle of the invention is as follows:

the invention relates to a water-based welding slag remover for butt welding of a pipeline circumferential weld, which plays a good role in protecting a welding bead and a welding gun against welding spatter; magnesium bicarbonate and feldspar in the adopted main components can play a good role in stabilizing electric arcs and play a role in cooling and isolating tiny welding metal splashing particles; the ethyl hydroxyethyl cellulose has good water solubility, good thermal stability and film forming property, and can effectively maintain the high-temperature stability and the timeliness of the welding slag remover in the high-temperature welding environment; the molybdate plays roles of corrosion inhibition and corrosion prevention, is volatile, and does not influence subsequent welding procedures; monohydric alcohols mainly play the roles of film forming, drying and dissolving assisting; the components act together, and a simple formula system is adopted to realize a good slag removal effect.

Compared with the prior art, the invention has the beneficial effects that:

1) by adopting the welding slag remover, the residual rate of welding spatter on the surfaces of base metals in the welding area of the circumferential weld of the pipeline and near the weld is extremely low, and the harm of the welding spatter on the welding area and the near base metals can be effectively reduced;

2) the welding flux has the advantages of environment-friendly and simple components, good heat resistance and timeliness, extremely low welding dust generation amount and no harm to human bodies and the surrounding environment;

3) the welding anti-spattering agent is neutral, and cannot corrode a welding structure or influence subsequent flaw detection and coating procedures; the service performances such as mechanical property and the like of the welding structure can be effectively ensured, and additional welding defects such as air holes, slag inclusion and the like are effectively prevented;

4) the welding slag remover can play a role in preventing welding spatter from blocking a welding nozzle and the like for a gas shielded welding gun, ensures the ventilation and the wire feeding of the welding gun, improves the stability of welding arc, and ensures the quality of welding seams; the slag removal work of field operators can be saved, the manufacturing labor and time cost are obviously reduced, and the welding production efficiency is improved.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the following examples, the particle size of feldspar used was 10 μm or less.

In the following examples, tap water was used as the water.

Example 1

A welding slag remover for a pipeline circumferential weld, a preparation method and an application method thereof comprise the following steps:

1) weighing the raw materials according to the mixture ratio, wherein the raw materials and the mass percentage of the raw materials are as follows: 3% of magnesium bicarbonate, 9% of feldspar, 1% of ethyl hydroxyethyl cellulose, 0.5% of magnesium molybdate, 5% of n-butyl alcohol and the balance of tap water;

2) uniformly mixing the weighed raw materials to obtain the welding slag remover;

3) coating the obtained welding slag remover on the welding area and the range of 100mm at two sides of the welding area by using a common spray can or a brushing means, and welding when the water stain disappears; simultaneously smearing the mixture in a conductive nozzle and a spray pipe of a gas shielded welding gun;

the welding process adopts phi 610mm multiplied by 7.9mm specification X52M steel tube circumferential weld butt welding, the welding groove is 60 degrees and V-shaped, multilayer multi-pass welding is adopted by adopting a gas shielded welding method, the welding current is 240-290A, the arc voltage is 26-33V, and the rest parameters are operated conventionally. After the first welding pass, extremely-small welding spatter particles with the diameter of 3mm can be removed by a steel brush. And welding the second path after 1 hour interval, and removing all splashing particles. After the continuous welding is finished, all the splashed particles can be removed.

The electric arc is stable in the welding process, the welding is free of defects, extremely low welding dust generation amount is generated, and welding spatters are not found inside and outside the welding gun contact tip and the spray pipe after welding. The slag remover has extremely low splashing residual rate, good timeliness and high temperature resistance. After the welding test plate is placed for 24 hours, the area of the welding test plate coated with the slag remover has no corrosion phenomenon, and tensile bending impact tests are carried out on the welding joint, so that the technical requirements of steel plate welding are met.

Example 2

A welding slag remover for a pipeline circumferential weld, a preparation method and an application method thereof comprise the following steps:

1) weighing the raw materials according to the mixture ratio, wherein the raw materials and the mass percentage of the raw materials are as follows: 7% of magnesium bicarbonate, 10% of feldspar, 9% of ethyl hydroxyethyl cellulose, 6.5% of ammonium molybdate, 11% of isobutanol and the balance of tap water;

2) uniformly mixing the weighed raw materials to obtain the welding slag remover;

3) coating the obtained welding slag remover on the welding area and the range of 100mm at two sides of the welding area by using a common spray can or a brushing means, and welding when the water stain disappears; simultaneously smearing the mixture in a conductive nozzle and a spray pipe of a gas shielded welding gun;

the welding process adopts phi 610mm multiplied by 16mm specification X60M steel tube circumferential weld butt welding, the welding groove is 60 degrees and V type, multilayer multi-pass welding is adopted by adopting a manual welding rod welding method, the welding current is 150-180A, the arc voltage is 22-24V, and the other parameters are operated according to the conventional method; after the first welding pass, extremely-small to 3 mm-diameter extremely-large welding spatter particles can be cleaned by a steel brush; and welding the second path after 1 hour interval, and removing all splashing particles. After the continuous welding is finished, all the splashed particles can be removed.

The electric arc is stable in the welding process, the welding is free of defects, extremely low welding dust generation amount is generated, and welding spatters are not found inside and outside the welding gun contact tip and the spray pipe after welding. The slag remover has extremely low splashing residual rate, good timeliness and high temperature resistance. After the welding test plate is placed for 24 hours, the area of the welding test plate coated with the slag remover has no corrosion phenomenon, and tensile bending impact tests are carried out on the welding joint, so that the technical requirements of steel plate welding are met.

Example 3

A welding slag remover for a pipeline circumferential weld, a preparation method and an application method thereof comprise the following steps:

1) weighing the raw materials according to the mixture ratio, wherein the raw materials and the mass percentage of the raw materials are as follows: 5% of magnesium bicarbonate, 11% of orthoclase, 5% of ethyl hydroxyethyl cellulose, 4.5% of sodium molybdate, 8% of neopentyl alcohol and the balance of tap water;

2) uniformly mixing the weighed raw materials to obtain the welding slag remover;

3) coating the obtained welding slag remover on the welding area and the range of 100mm at two sides of the welding area by using a common spray can or a brushing means, and welding when the water stain disappears; simultaneously smearing the mixture in a conductive nozzle and a spray pipe of a gas shielded welding gun;

the welding process adopts phi 610mm multiplied by 6.3mm specification L360M steel tube circumferential weld butt welding, the welding groove is 60 degrees and V-shaped, multilayer multi-pass welding is adopted by adopting a gas shielded welding method, the welding current is 270-330A, the arc voltage is 27-34V, and the rest parameters are operated conventionally. After the first welding pass, extremely-small welding spatter particles with the diameter of 3mm can be removed by a steel brush. And welding the second path after 1 hour interval, and removing all splashing particles. After the continuous welding is finished, all the splashed particles can be removed.

The electric arc is stable in the welding process, the welding is free of defects, extremely low welding dust generation amount is generated, and welding spatters are not found inside and outside the welding gun contact tip and the spray pipe after welding. The slag remover has extremely low splashing residual rate, good timeliness and high temperature resistance. After the welding test plate is placed for 24 hours, the area of the welding test plate coated with the slag remover has no corrosion phenomenon, and tensile bending impact tests are carried out on the welding joint, so that the technical requirements of steel plate welding are met.

The above embodiments are merely examples for clearly illustrating the present invention and do not limit the present invention. Other variants and modifications of the invention, which are obvious to those skilled in the art and can be made on the basis of the above description, are not necessary or exhaustive for all embodiments, and are therefore within the scope of the invention.