阅读说明：本技术 一种提高抗菌不锈钢焊缝抗菌性能的方法和装置 (Method and device for improving antibacterial property of antibacterial stainless steel weld joint ) 是由 范海生 宋鸿武 路林 杨柯 于 2020-07-28 设计创作，主要内容包括：本发明属于抗菌不锈钢技术领域,特别涉及一种提高抗菌不锈钢焊缝抗菌性能的方法和装置。该方法包括如下步骤：(1)在TIG焊基础上加一个脉冲磁场发生器,调制脉冲磁场,在TIG焊的电弧区产生脉冲磁场,同时由TIG焊机输出焊接电流；(2)脉冲磁场作用于TIG焊的电弧,从而使TIG焊的电弧能量提高,实现焊缝的快热与快冷。该装置包括：脉冲磁场发生器、TIG焊机、钨极、TIG焊枪、脉冲磁场线圈、抗菌不锈钢工件。本发明实现磁箍缩效应压缩焊接电弧,获得更高的电弧能量密度,实现焊缝的快热与快冷,最终实现抗菌不锈钢器具高速焊接生产,焊速从常规焊速0.5m/min提高到5.5m/min,且焊缝的抗菌性高于母材。(The invention belongs to the technical field of antibacterial stainless steel, and particularly relates to a method and a device for improving antibacterial performance of an antibacterial stainless steel weld joint. The method comprises the following steps: (1) adding a pulse magnetic field generator on the basis of TIG welding to modulate a pulse magnetic field, generating a pulse magnetic field in an arc area of the TIG welding, and outputting welding current by a TIG welding machine; (2) the pulsed magnetic field acts on an electric arc of the TIG welding, so that the energy of the electric arc of the TIG welding is improved, and the fast heating and the fast cooling of a welding line are realized. The device includes: the device comprises a pulsed magnetic field generator, a TIG welding machine, a tungsten electrode, a TIG welding gun, a pulsed magnetic field coil and an antibacterial stainless steel workpiece. The invention realizes the magnetic pinch effect to compress the welding arc, obtains higher arc energy density, realizes the fast heating and fast cooling of the welding line, and finally realizes the high-speed welding production of the antibacterial stainless steel appliance, the welding speed is improved to 5.5m/min from the conventional welding speed of 0.5m/min, and the antibacterial property of the welding line is higher than that of the parent metal.)

1. A method for improving antibacterial performance of an antibacterial stainless steel weld joint is characterized by comprising the following steps:

(1) adding a pulse magnetic field generator on the basis of TIG welding to modulate a pulse magnetic field, generating a pulse magnetic field in an arc area of the TIG welding, and outputting welding current by a TIG welding machine;

(2) the pulsed magnetic field acts on an electric arc of the TIG welding, so that the energy of the electric arc of the TIG welding is improved, and the fast heating and the fast cooling of a welding line are realized.

2. The method for improving the antibacterial property of the antibacterial stainless steel weld joint according to claim 1, wherein the range of excitation induction intensity of the pulsed magnetic field is 0.001-0.1T, the range of excitation frequency is 1-5 kHz, and the adjustment range of duty ratio is 45-55%.

3. The method for improving the antibacterial property of the antibacterial stainless steel weld joint according to claim 1, wherein the welding arc is compressed by the magnetic pinch effect of the pulsed magnetic field to obtain the arc energy density of 30-50A/mm²The arc pressure is 0.5 to 1KPa and the arc diffusion angle is 10 to 15 degrees.

4. The method for improving the antibacterial property of the antibacterial stainless steel weld joint according to claim 1, characterized in that the welding speed of TIG welding is adjusted within the range of 1.5-5.5 m/min, and the weld joint cooling speed v is adjusted_8/5The range is 1000 to 1500 ℃/s.

5. An apparatus for improving the antimicrobial properties of an antimicrobial stainless steel weld used in the method of any one of claims 1 to 4, the apparatus comprising: the pulse magnetic field generator, the TIG welding machine, the tungsten electrode, the TIG welding gun, the pulse magnetic field coil, antibiotic stainless steel work piece, the concrete structure is as follows:

the TIG welding machine is respectively connected with a TIG welding gun and an antibacterial stainless steel workpiece through lines, a tungsten electrode is vertically arranged on the TIG welding gun, the lower portion of the tungsten electrode corresponds to the horizontal antibacterial stainless steel workpiece, the pulsed magnetic field generator is connected with the pulsed magnetic field coil through lines, the pulsed magnetic field coil is arranged above and below the antibacterial stainless steel workpiece, the tungsten electrode is located in the pulsed magnetic field coil, and the TIG welding gun is transmitted to the antibacterial stainless steel workpiece through a welding electric arc generated by the tungsten electrode under the action of a pulsed magnetic field generated by the pulsed magnetic field coil.

6. The device for improving the antibacterial property of the antibacterial stainless steel weld joint according to claim 5, wherein a direct current direct connection mode is adopted in a TIG welding machine, the current range is 0-500A, and the device has the direct current and alternating square wave output functions.

Technical Field

The invention belongs to the technical field of antibacterial stainless steel, and particularly relates to a method and a device for improving antibacterial performance of an antibacterial stainless steel weld joint.

Background

The root cause of human diseases is caused by the invasion of various harmful germs and viruses to human bodies, and particularly with the abuse of novel coronavirus epidemic situations, the complicated living environment and conditions on which people live are likely to provide conditions and opportunities for the invasion of various harmful germs and viruses to human bodies, so that the human health is harmed, and various diseases are generated. The antibacterial stainless steel is a novel metal material with structure/function integration characteristics appearing at the end of the last century, and is a novel material with broad-spectrum and lasting sterilization or bacteriostasis functions and the like. And the copper-rich bactericidal phase is uniformly distributed in the stainless steel and is not influenced by friction and abrasion, so that the bactericidal function of the antibacterial stainless steel is durable. At present, water storage tanks, water delivery pipelines, filter screens, tableware, syringes, scalpels and other environments in hospitals in various places which are easy to cause bacteria and virus breeding begin to adopt antibacterial materials for product design and manufacture.

TIG Welding (Tungsten Inert Gas Welding), also known as argon Tungsten arc Welding. The antibacterial stainless steel appliance is finally assembled and welded, welding is generally completed by an industrial robot matched with a multi-axis turnover positioner through a TIG welding method, continuous work of all stations is realized, the automation degree is high, the uniformity of welding spots is high, and the quality is stable. The production bottleneck of the antibacterial stainless steel appliance is to ensure the antibacterial property of the welding line, and a large number of early experimental results show that the welding line characteristic needs faster welding and cooling speeds, which is consistent with the requirement of high-efficiency production. At present, the TIG welding speed is low and is about 0.3-0.8 m/min, the maximum working speed of an industrial robot can reach 120m/min, and great speed difference exists. The existing single station is at least provided with more than 1 industrial robot, some instruments with more welding seams even need more than 10 industrial robots, namely, single-station multi-machine welding, and the production efficiency is extremely low. How to realize single-machine multi-station welding is the foremost research focus in the field, effectively improves the arc welding speed, and becomes the key point for solving the problems.

Disclosure of Invention

The invention aims to provide a method and a device for improving the antibacterial property of an antibacterial stainless steel weld joint, which improve the fast heating and fast cooling speed of the weld joint by using an external pulsed magnetic field and improve the antibacterial property of the antibacterial stainless steel weld joint.

The technical scheme of the invention is as follows:

a method for improving antibacterial performance of an antibacterial stainless steel weld joint comprises the following steps:

(1) adding a pulse magnetic field generator on the basis of TIG welding to modulate a pulse magnetic field, generating a pulse magnetic field in an arc area of the TIG welding, and outputting welding current by a TIG welding machine;

(2) the pulsed magnetic field acts on an electric arc of the TIG welding, so that the energy of the electric arc of the TIG welding is improved, and the fast heating and the fast cooling of a welding line are realized.

According to the method for improving the antibacterial performance of the antibacterial stainless steel welding line, the excitation induction intensity range of the pulse magnetic field is 0.001-0.1T, the excitation frequency range is 1-5 kHz, and the duty ratio adjusting range is 45-55%.

The method for improving the antibacterial property of the antibacterial stainless steel welding line compresses the welding electric arc through the magnetic pinch effect of the pulsed magnetic field to obtain the electric arc with the energy density of 30-50A/mm²The arc pressure is 0.5 to 1KPa and the arc diffusion angle is 10 to 15 degrees.

According to the method for improving the antibacterial property of the antibacterial stainless steel welding line, the welding speed adjusting range of TIG welding is 1.5-5.5 m/min, and the welding line cooling speed v_8/5The range is 1000 to 1500 ℃/s.

The device for improving the antibacterial property of the antibacterial stainless steel welding line used by the method comprises: the pulse magnetic field generator, the TIG welding machine, the tungsten electrode, the TIG welding gun, the pulse magnetic field coil, antibiotic stainless steel work piece, the concrete structure is as follows:

the TIG welding machine is respectively connected with a TIG welding gun and an antibacterial stainless steel workpiece through lines, a tungsten electrode is vertically arranged on the TIG welding gun, the lower portion of the tungsten electrode corresponds to the horizontal antibacterial stainless steel workpiece, the pulsed magnetic field generator is connected with the pulsed magnetic field coil through lines, the pulsed magnetic field coil is arranged above and below the antibacterial stainless steel workpiece, the tungsten electrode is located in the pulsed magnetic field coil, and the TIG welding gun is transmitted to the antibacterial stainless steel workpiece through a welding electric arc generated by the tungsten electrode under the action of a pulsed magnetic field generated by the pulsed magnetic field coil.

According to the device for improving the antibacterial property of the antibacterial stainless steel weld joint, the TIG welding machine adopts direct current positive connection, the current range is 0-500A, and the device has the direct current and alternating square wave output function.

The design idea of the invention is as follows:

the invention provides a method and a device for improving antibacterial performance of an antibacterial stainless steel weld joint, which master a pulsed magnetic field pinch electric arc welding key technology by researching a synergistic action rule of a pulsed magnetic field and a welding current pulse and an electric arc magnetic pinch mechanism of the pulsed magnetic field. Therefore, the magnetic pinch effect is realized to compress the welding arc, higher arc energy density is obtained, the fast heating and fast cooling of the welding line are realized, the high-speed welding production of the antibacterial stainless steel appliance is finally realized, the welding speed is increased to 5.5m/min from the conventional welding speed of 0.5m/min, and the antibacterial property of the welding line is higher than that of the parent metal.

The invention has the advantages and beneficial effects that:

1. the method and the device for improving the antibacterial property of the antibacterial stainless steel welding line realize the magnetic pinch effect to compress the welding arc, and obtain higher arc energy density of 30-50A/mm²The larger arc pressure is 0.5-1 KPa, the better arc stiffness is achieved, the diffusion angle is 10-15 degrees, the high-speed welding production of the antibacterial stainless steel device is finally realized, the welding speed is increased to 5.5m/min from the conventional welding speed of 0.5m/min, and the antibacterial property of the welding line is higher than that of the base metal.

2. The invention realizes rapid welding and rapid cooling by applying an external pulse magnetic field, and the process has the advantages of low additional device cost, small volume and convenient use, and can improve the arc form and the arc behavior.

Drawings

FIG. 1 is a schematic structural diagram of an apparatus for improving antibacterial performance of an antibacterial stainless steel weld joint according to the present invention. In the figure, 1. a pulsed magnetic field generator; 2, TIG welding machine; 3. a tungsten electrode; 4, TIG welding gun; 5. a pulsed magnetic field coil; 6. an antibacterial stainless steel workpiece.

FIG. 2 is a photograph of bacterial colonies of the antibacterial stainless steel welding line, the antibacterial stainless steel base material, the 304 stainless steel welding line and the 304 stainless steel base material after being cultured for 24 hours by respectively adopting Escherichia coli.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings in which:

as shown in fig. 1, the apparatus for improving antibacterial property of antibacterial stainless steel weld joint of the present invention mainly comprises: the pulse magnetic field generator 1, the TIG welding machine 2, the tungsten electrode 3, the TIG welding gun 4, the pulse magnetic field coil 5 and the antibacterial stainless steel workpiece 6 have the following specific structure:

the TIG welding machine 2 is respectively connected with a TIG welding gun 4 and an antibacterial stainless steel workpiece 6 through lines, a tungsten electrode 3 is vertically arranged on the TIG welding gun 4, the lower part of the tungsten electrode 3 corresponds to the horizontal antibacterial stainless steel workpiece 6, a pulsed magnetic field generator 1 is connected with a pulsed magnetic field coil 5 through lines, the pulsed magnetic field coil 5 is arranged above and below the antibacterial stainless steel workpiece 6, the tungsten electrode 3 is positioned in the pulsed magnetic field coil 5, and the TIG welding gun 4 transmits welding electric arcs generated by the tungsten electrode 3 to the antibacterial stainless steel workpiece 6 under the action of a pulsed magnetic field generated by the pulsed magnetic field coil 5.

As shown in FIG. 1, the method for improving the antibacterial property of the antibacterial stainless steel weld joint comprises the following specific implementation steps:

the method comprises the following steps: the TIG welding machine 2 adopts direct current positive connection, the current range is 0-500A, and the TIG welding machine has the direct current and alternating square wave output function. According to the characteristics of the antibacterial stainless steel, selecting TIG welding process parameters such as: welding current, flow of shielding gas (argon), diameter and end shape of the tungsten electrode, distance between the end of the tungsten electrode and a workpiece, and the like. In the embodiment, 200A alternating square wave direct current pulse is adopted during welding, the argon flow is 8L/min, the diameter of a nozzle of a TIG welding gun is 10mm, and the height of the nozzle of the TIG welding gun from an antibacterial stainless steel workpiece is 5 mm. The diameter of the tungsten electrode is 1.6mm, the end part of the tungsten electrode is conical, and the distance between the end part of the tungsten electrode and the antibacterial stainless steel workpiece is 2-3 mm.

Step two: the output end of the pulsed magnetic field generator 1 is connected to the pulsed magnetic field coil 5, and the TIG welding gun 4 is ensured to be vertical to the antibacterial stainless steel workpiece 6 for welding. Wherein the range of excitation induction intensity is 0.001-0.1T, the range of excitation frequency is 1-5 kHz, the adjustment range of duty ratio is 45-55%, the adjustment range of welding speed is 1.5-5.5 m/min, and the welding seam is coldVelocity v of cooling_8/5The range is 1000 to 1500 ℃/s.

Step three: by changing the strength of the pulse magnetic field and the frequency of the magnetic field, the energy of the electric arc is improved, and fast welding and fast cooling are realized. In this embodiment, the excitation induction intensity is 0.05T, the excitation frequency is 3kHz, and the duty ratio is 50%.

In the embodiment, the welding arc is compressed by the magnetic pinch effect, and the higher energy density of the arc is 40A/mm²The larger electric arc pressure is 0.8KPa, the better electric arc stiffness is achieved, the diffusion angle is 15 degrees, the high-speed welding production of the antibacterial stainless steel device is finally realized, the welding speed is increased to 5.5m/min from the conventional welding speed of 0.5m/min, and the cooling speed v of the welding seam is_8/51200 ℃/s, and the antibacterial property of the welding line is higher than that of the parent metal.

As shown in FIG. 2, the bacterial colony status of the antibacterial stainless steel weld and the antibacterial stainless steel base material, and the bacterial colony status of the antibacterial stainless steel weld and the bacterial colony status of the antibacterial stainless steel base material 304 after 24h of culture are compared. According to the statistical result, the colony number of the antibacterial stainless steel welding line is 0, the colony number of the 304 stainless steel welding line is about 2000, and the antibacterial rate of the antibacterial stainless steel welding line is 100%; the colony number of the antibacterial stainless steel parent material is about 30-40, and the colony number of the 304 stainless steel parent material is about 2000, so that the antibacterial rate of the antibacterial stainless steel parent material is 98-99%. Therefore, the antibacterial rate of the antibacterial stainless steel welding line is better than that of the parent material.