MP-3 electrodes - characteristics and features of use

What is Uoni 13 55?

UONI-13/55 electrodes with a basic coating are intended for manual electric arc welding of especially critical structures made of low-carbon, medium-carbon and low-alloy steels operating under alternating loads and negative temperatures down to -50 ° C.

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Standard electrode weight

The current GOST provides standards for filler, thickness, and other parameters of the rod for welding. Moreover, the weight of one electrode of the same size is not always identical. The standard error is 1-2 g. The main parameter is the weight of the package.

The indicator of one element is calculated by the formula: the mass of the box is divided by the number of rods placed in it. This rule does not work for artisanal and dubious manufacturers.

3 mm

The weight of a pack of electrodes, regardless of manufacturer brands, differs in different batches. This depends on the amount of coating that is applied in an uneven layer. The weight is affected by the size of the rod; modifications of 2.5 and 4 mm will be 5 mm lighter than their counterparts. One electrode with a diameter of 3 mm weighs 26.4 g (the error in both directions does not exceed 2 g).

4 mm

It should be taken into account that if the pack says 5 kg, in fact the weight will be less. If the indicator is reduced by several tens of grams, this is a clear underweight. Unscrupulous sellers often take several electrodes out of the packages, selling them individually, increasing profits. In this regard, the product should be purchased from official representatives or trusted retail outlets.

For example, the weight of a 4 mm rod is nominally up to 59.9 g, and a 5 mm rod is already from 83 to 95 g.

Transportation conditions

Electrodes must be transported by covered road or rail transport, as well as in railway and sea containers.

During transportation, pallets with electrodes must be installed tightly to each other; if there are gaps, they must be secured using boards or fiberboard.
Packing depending on the diameter of the electrodes

Number of electrodes on pallet

Note. * Packs of electrodes weighing 0.9 kg are packed in blocks of 4 boxes, each block is packed in polyethylene shrink film, at least 100 microns thick.

How much does a pack of OK 46 electrodes weigh?

Electrode brand: OK-46 Weight: 5.3 kg Only at AtlantGroup you will find competitive prices.

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Weight of one electrode

Although the thickness of the coating and the material of the rod are standardized values ​​determined by GOST, errors are inevitable during the production process, which will affect the weight of the final product. A discrepancy of 1-2 g is considered acceptable. After all, the prevailing indicator will be the weight of the pack, measured in grams, and the weight of one electrode can be found out by a simple arithmetic operation: divide the total weight of the box by the total number of products in it.

Electrodes weight 1 piece. Electrode packaging

Many welders are interested in the question: “How much does one electrode weigh?” And for good reason. This indicator is very important for the selection of materials. Knowing reliable information, you will be able to avoid deception, but also choose rods with the required weight.

These indicators greatly influence the outcome of welding work, and also the condition of the finished joints. But don’t forget about the coating, diameter and condition of the products.

Our article will discuss the weight of a pack and a single electrode. You will find out how many parts are put in a single pack. With this information you will be protected.

• A short introduction
• Number of anticathodes
• Anticathode weight
• Let's sum it up

Number of electrodes

The number of electrodes in a pack is a very important parameter. The weight of the pack and one electrode largely depends on it. And this, in turn, affects the size of the package.

With quantity, everything is simple: the larger the diameter and length of the electrodes, the fewer of them there will be in the pack. In fact, it is not so important for you, as an ordinary buyer, to know the number of electrodes in a pack.

This information is more useful for wholesalers and those who purchase electrodes in large quantities. Below you can see how many electrodes are in a pack of the UONI-13/55 brand. These are average values ​​and may vary depending on the manufacturer:

Requirements for transport packaging

Each cardboard box must be packed in polyethylene shrink film with a thickness of at least 100 microns.

To ensure transport and warehouse operations, boxes are stacked and secured on specially designed wooden pallets. Wooden pallets have dimensions of 630x960 mm. The support bars provide a clearance of 120 mm between the floor and decking. The height of the electrodes on the pallet should not exceed 600 mm. By agreement with the customer, electrodes can be laid on Euro pallets.

Boxes with electrodes on pallets have additional protection from dust and precipitation:

• on top - with plastic film laid on the boxes and (or) wrapped with stretch film;
• on the sides – wrapped with stretch film;
• A packing list is placed under the stretch film indicating the brand of electrodes, diameter, batch number and weight of the electrodes on the pallet.

Boxes with electrodes on pallets are additionally secured with polypropylene tape around the perimeter with steel clips.

Pack weight depending on brand and manufacturer

Examples include weighing scales from the following brands and manufacturers:

Table of the number of electrodes in a pack by diameter

In addition to weight, when calculating the volume of welding work, the number of elements in the box plays an important role. Experienced craftsmen know all the subtleties of choosing by eye, without studying the inscriptions on the packaging. Beginner welders and inexperienced people need more information. The table shows standard data on the number of electrodes in a pack.

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The packaging of MMA welding elements indicates the main technical parameters of the product. Among them:

• manufacturer;
• product brand;
• batch number;
• length and diameter of rods;
• industry of destination;
• date of manufacture.

The box also contains other relevant information (welding modes, calcination temperature, manufacturing features, safety measures, general recommendations).

Pack weight

GOST 94 466 – 75 regulates the mass of electrodes in a pack depending on the diameter. According to clause 6.2. of this document, the parameters should not exceed the following values:

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Thus, these are not strictly fixed standards, but an indication of the permissible limit. However, manufacturers, as a rule, adhere to these figures. Other documents, such as GOST R ISO 2560-A and GOST 9467-75, impose requirements on the type of coating, mechanical strength of the weld metal, etc.

GOST 94 466 – 75. clause 6.2. The deviation of the mass of electrodes in a box or pack from that indicated on the label or marking should not exceed half the calculated mass of one electrode in the direction of decrease and the calculated mass of two electrodes in the direction of increase.

How many pieces of electrodes are in a pack for 1-5 kg

Electrodes for MMA welding are consumables, without which it is impossible to carry out welding work. The electrode is a metal rod onto which a special coating material was applied during the manufacturing process. The electrode coating is designed to protect the weld pool from the negative effects of oxygen, and its main manufacturing component is the charge, which contains various mineral elements.

Most often, information regarding the composition of the charge cannot be seen on the electrode markings. However, as for the diameter and some other characteristics, manufacturers most often indicate them on the packaging.

In some cases, in order to calculate the required number of electrodes for welding, you need to know how many of them are in the pack.

What is indicated on the box with electrodes

The following technical characteristics of the product are indicated on the box with electrodes for MMA welding:

• Manufacturer;
• Brand of electrodes;
• Length and diameter (diameter is the most important);
• Scope of electrodes;
• Batch number and date of manufacture.

Also on the packaging with electrodes for manual arc welding, various other useful information is indicated. For example, welding modes of use, the mass of electrodes, their temperature and calcination time.

How many pieces of electrodes are in a pack for 1-3-5 kg

To find out how many electrodes are in one pack, you should find out how much weight one electrode has. The mass of one electrode depends on the diameter and thickness of the coating.

In order not to be unfounded, the mass values ​​for electrodes of different diameters should be given:

• Electrode 2.5 mm - weighs 17 g;
• Electrode 3 mm - weight is already 26 g;
• Electrode 4 mm - weighs 58 g;
• The electrode is 5 mm - its weight is about 80 g.

According to these data, it is possible to calculate the approximate number of electrodes in one pack:

• Electrode 3 mm (length 35 cm), package weight 3 kg - 95 pieces;
• Electrode 4 mm (length 45 cm), package weight 5 kg - 82 pieces;
• Electrode 5 mm (length 45 cm), package weight 5 kg - 52 pieces.

According to GOST 94 466 - 75. clause 6.2 - the mass of one electrode can be more or less, within 1-2 g. Now you know how many electrodes are in one pack of 3 or 5 kg. Knowing this, you can correctly calculate the required number of electrodes for welding and not blush in front of the customer for the miscalculations made.

Features of using MP-3 electrodes

To work with MP-3 electrodes, both direct and alternating current sources can be used. The current sources used must provide an open circuit voltage (OCV) of at least 50V. If a direct current source is used, then welding should be performed with reverse polarity (the plus is connected to the electrode). Welding electrodes of the MP-3 brand allow you to perform work in different spatial positions.

Products of the MP-3 brand are distinguished by the following technological characteristics:

• the welding arc ignites easily and is characterized by high combustion stability;
• easy formation of a weld seam;
• minimal metal spattering;
• the slag crust that forms on the surface of the weld is easily separated;
• re-ignition of the arc is also easy;
• Welding work performed using MP-3 electrodes is characterized by high productivity, as well as the quality of the resulting seam.

The weld metal, like the deposited metal, has the following characteristics: mechanical tensile strength (temporary) - up to 46 kgf/mm2, which corresponds to 450 MPa; impact strength indicator - 8 kgf m/cm2 (80 J/cm2); relative elongation - 18%; bend angle (for a welded joint) - 150 degrees.

The welding current to which the power source must be adjusted depends both on the diameter of the electrode and on the spatial position of the seam being formed:

• Products D 3 mm: vertical seams - 90-110A, bottom seams - 100-140A, ceiling seams - 100-120A;
• D 4 mm: vertical seams - 140-180A, bottom - 160-220A, ceiling - 140-180A;
• D 5 mm: vertical seams - 160-200A, bottom - 180-260A;
• D 6 mm: only lower seams - 300-360A.

The technical characteristics of the electrodes also include their consumption for depositing a certain amount of weld metal. So, in order to deposit 1 kg of metal, 1.7 kg of MP-3 electrodes are needed. At the same time, electrodes of this brand provide a productivity equal to 1.7 kg/h (products D 4 mm), and the deposition coefficient corresponds to a value of 8.5 g/Ah.

Blue welding electrodes MP-3C

Features of products of the MR-3 and MR-3s brands

MR-3s electrodes, like products of the MR-3 brand, allow welding with a long arc, as well as with short tack welding. What is important is that the technical characteristics of products of these brands allow you to work without wasting time on preliminary preparation of the metal to be welded. The surface of the parts that need to be connected can be:

• wet;
• not well cleaned from various contaminants and oxides;
• with traces of corrosion.

Electrodes of the MR-3s brand, as well as products of the MR-3 brand, can be used when welding must be performed along the existing gap. The welding current should be minimal, otherwise the finished seam may turn out porous.

In addition to MP-3 brand products, MP-3m and MP-3s electrodes are actively used. The first ones (MR-3m) are distinguished by the fact that they are coated with rutile-ilmenite coating. Electrodes of the MP-3c brand (blue) use a coating enriched with additional ionizing additives. Both MP-3m and MP-3s electrodes are almost identical to MP-3 brand products in their characteristics.

The coating applied to the MP-3s electrodes makes it easier to ignite the welding arc, which makes it possible to use them when working with low-power current sources. Products of this brand are also more environmentally friendly: when working with them, a significantly smaller amount of harmful substances are released than when working with MP-3 (0.6 grams of manganese for MP-3s and 1.25 for MP-3). Moreover, when working with them, the weld is of higher quality, which significantly improves the characteristics of the joint being formed.