CN104889603A - Stainless steel welding rod and manufacturing method thereof - Google Patents

Abstract

The invention discloses a stainless steel welding rod and a manufacturing method thereof. The stainless steel welding rod comprises a metal welding core and a covering, wherein the metal welding core comprises a working part and a clamping part which are fixedly connected; the working part and the clamping parts have same diameter; the working part is an iron alloy wire; the clamping part is an aluminum-magnesium alloy wire; the working part comprises the following components in percentage by weight: smaller than or equal to 0.03 percent of C, 0.4-1.2 percent of Mn, 0.5-1.0 percent of Si, 13-15 percent of Cr, 5-6 percent of Ni and the balance of iron and inevitable impurities. According to the method, the working part and the clamping part are in friction welding to form the welding core, and the outer surface is coated with the covering. The stainless steel welding rod can realize automatic separation of the clamping part and a weld joint. The material of the covering of the working part is improved to be more suitable for welding of stainless steel to adapt to welding of various containers and pipelines in the fields such as chemical industry, energy sources and foods.

Description

Stainless steel electrode and manufacture method thereof

Technical field

The present invention relates to a kind of covered electrode for arc welding, be specifically related to a kind of stainless steel electrode and manufacture method thereof.

Background technology

SMAW is most widely used welding method in industrial production; belong to the metal arc welding of gas-slag Combined Protection; its principle is that welding rod and workpiece melt mutually and form weld seam after condensation by the heat utilizing arc discharge to produce, thus between workpiece, obtain firmly combination interface.There is flexibility good, easy to operate, low for matching requirements before weldering, the advantages such as equipment is simple.Although so the welding equipment of the automation such as large-scale application gas shielded welding machine and welding robot in manufacture of steel structure at present, still need to adopt traditional SMAW to carry out human weld in the weld seam of some complexity.

The instrument that manual electric arc welding adopts usually is soldering turret, and its jaw is for clamping the tail end of welding rod.Correspondingly welding rod afterbody has one section of naked core wire, accounts for 1/16 of welding rod overall length, clamps and be conducive to conduction for soldering turret.During use, the coating being coated on core wire outer surface forms gas and slag decompose fusing in welding process after, plays mechanical protection, Metallurgical processing, improves the effect of processing performance.And welding rod afterbody is for the protection of the exposed part clamped due to shortage coating, also clamping, with in jaw, cannot obtain utilization, usually burn close to being abandoned during afterbody and more renewing welding rod at welding rod simultaneously.For the ease of manufacture in enormous quantities, existing welding rod core wire adopts drawing process to form the wire of the homogeneous of certain diameter mostly, applies coating and retain one end exposed part at its tail end after cutting into designated length in outside.

The complicated large-scale steel structure such as ground jack, marine drilling platform and boats and ships as in, the specific position of some weld seam causes its welding and inspection all to there is great difficulty.If just complete certain hidden weld seam during welding rod operate portions after-flame, welder directly may unclamp soldering turret, causes discard electrode to be left over and has been solidificated in the end of weld seam.In the use of mechanical device, discard electrode existence comes off and snaps in the risk in mechanical device, as seen under specific application conditions, there is very high requirement to the separating power of discard electrode and weld seam.

Summary of the invention

Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of stainless steel electrode not easily remaining discard electrode at the end of welding, proposes the manufacture method of this stainless steel electrode simultaneously.

Technical scheme: for solving the problems of the technologies described above, stainless steel electrode provided by the invention, comprise metal core wire and coating, metal core wire comprises the operate portions and clamping part that are fixedly connected with, described operate portions is identical with the diameter of clamping part, described operate portions is ferroalloy silk, described clamping part is aluminum-magnesium alloy wire, each constituent content of described operate portions is C :≤0.03%, Mn:0.4% ~ 1.2%, Si:0.5% ~ 1.0%, Cr:13% ~ 15%, Ni:5% ~ 6%, all the other are iron and inevitable impurity.

As preferably, the junction outer application of described clamping part and described operate portions has coating.

As preferably, the coating outside described clamping part is coated with humidity chromogenic indicator.

As preferably, the top of described operate portions is taper, and the drift angle of described taper is 40 ° ~ 100 °.

As preferably, described operate portions adopts the mode of friction welding to be connected with the junction of clamping part, particularly, two ends operate portions and clamping part being held on respectively relative rotation, guarantee that its coaxial rear end face mutually compresses and relatively rotates, the frictional heat and the molecular migration that generate at contact surface make both combine fast, link into an integrated entity after rotating stopping.

The present invention proposes the manufacture method of above-mentioned stainless steel electrode simultaneously, comprises the following steps:

1) the ferroalloy silk of designated length is intercepted as operate portions;

2) aluminum-magnesium alloy wire of designated length is intercepted as clamping part;

3) adopt the mode of friction welding (FW) by operate portions and the integrally welded core wire of clamping part;

4) the operate portions top of core wire is mitered into taper, angle of chamfer is 20 ° ~ 50 °;

5) dry at core wire outer surface coating;

6) on the interface of coating and clamping part, humidity chromogenic indicator is applied.

Beneficial effect: the present invention utilizes the contact interface of welding rod operate portions and clamping part to design, utilize the characteristic of different metal and coating, realize automatically disengaging of discard electrode when welding rod is about to use up, thoroughly avoid the residual of discard electrode, be specially adapted to the manual electric arc welding of labyrinth.

And adopt almag as clamping part, on the clamping end face of soldering turret, have good electric conductivity on the one hand, when welding process total working portion melts most, the combination interface of clamping part can form MgO and Al simultaneously ₂o ₃spinel welding slag, possess stronger detachability with the weld seam of molten state.

Make it be more applicable for stainless welding to the coating material improvement of operate portions, be applicable to the various container in chemical industry and the field such as the energy, food and the welding of pipeline.

The measure of further increase humidity chromogenic agent, directly can check the preservation acceptable level of welding rod before use, if humidity over limit, is entered drying baker and dries, until colour developing is normal, avoids because the improper failure welding caused preserved by welding rod.

Detailed description of the invention

Embodiment: a kind of stainless steel electrode, comprises metal core wire and coating, and metal core wire comprises the operate portions and clamping part that are fixedly connected with, and described operate portions is identical with the diameter of clamping part, and described operate portions is ferroalloy silk, and described clamping part is aluminum-magnesium alloy wire.

The stainless steel electrode of the present embodiment only need carry out part on existing manufacturing process basis to be improved, the component of coating remains unchanged, just the material of the part of soldering turret clamping changes aluminum-magnesium alloy wire into, each constituent content of core wire operate portions is C :≤0.03%, Mn:0.4% ~ 1.2%, Si:0.5% ~ 1.0%, Cr:13% ~ 15%, Ni:5% ~ 6%, all the other are iron and inevitable impurity.

The length adjustment of being cut by core wire during manufacture is the length that raw footage deducts clamping part, and taper is made on the top of core wire, and cutting angle is 20 ° ~ 50 °.The mode of friction welding is adopted to be connected with the junction of clamping part operate portions, concrete mode is that operate portions and clamping part are held on whirligig as on lathe, guarantee that its coaxial rear end face compresses mutually, relatively rotate and rub, the frictional heat generated at contact surface to be formed with molecular migration and is firmly combined, in the metallic rod that rotation stopping becomes to be integrated afterwards.

Coating is mixed with pasty state according to component, be coated in core wire outer surface, and covering original core wire and a bit of clamping part, the coating outside clamping part is coated with humidity chromogenic indicator, and this developer adopts the water suction such as silica gel, calcium chloride off-color material ripe in prior art.Last baking and curing and plastic.

Test according to GB/T983-95 after manufacture completes, property indices meets the requirement of standard.

During use, the stainless steel electrode of the present embodiment is applied to manual electric arc welding, when the contact interface of welding rod by after-flame to two kind of alloy, aluminum-magnesium alloy wire is Quick Oxidation at high temperature, forms MgO and Al of Spinel ₂o ₃oxide welding slag, is separated with the core wire melted, and the gas formed by coating and welding slag are isolated, and reaches the effect of separation automatically.Even if now just arrive the end arc extinguishing of weld seam, discard electrode also can Automatic-falling, and welder no longer needs firmly to be pulled away from commissure by discard electrode, thoroughly avoids the problem that discard electrode is residual.

With above-mentioned according to desirable embodiment of the present invention for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this invention technological thought, can carry out various change and amendment completely.The technical scope of this invention is not limited to the content on description, must determine its technical scope according to right.

Claims (6)

1. a stainless steel electrode, comprise metal core wire and coating, described metal core wire comprises the operate portions and clamping part that are fixedly connected with, described coating is coated on the outer surface of described operate portions, described operate portions is identical with the diameter of clamping part, it is characterized in that: described operate portions is ferroalloy silk, described clamping part is aluminum-magnesium alloy wire, each constituent content of described operate portions is C :≤0.03%, Mn:0.4% ~ 1.2%, Si:0.5% ~ 1.0%, Cr:13% ~ 15%, Ni:5% ~ 6%, all the other are iron and inevitable impurity.

2. stainless steel electrode according to claim 1, is characterized in that: the junction outer application of described clamping part and described operate portions has coating.

3. stainless steel electrode according to claim 1, is characterized in that: the coating outside described clamping part is coated with humidity chromogenic indicator.

4. stainless steel electrode according to claim 1, is characterized in that: the top of described operate portions is taper, and the drift angle of described taper is 40 ° ~ 100 °.

5. stainless steel electrode according to claim 1, is characterized in that: described operate portions adopts the mode of friction welding to be connected with the junction of clamping part.

6. a manufacture method for stainless steel electrode, is characterized in that comprising the following steps:

1) the ferroalloy silk of designated length is intercepted as operate portions;

2) aluminum-magnesium alloy wire of designated length is intercepted as clamping part;

3) adopt the mode of friction welding (FW) by operate portions and the integrally welded core wire of clamping part;

4) the operate portions top of core wire is mitered into taper, angle of chamfer is 20 ° ~ 50 °;

5) dry at core wire outer surface coating;

6) on the interface of coating and clamping part, humidity chromogenic indicator is applied.