The design of the welding source of alternating current. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Electrician

Electric welding. The design of the welding source of alternating current. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / welding equipment

Comments on the article

The winding data are given below and the design of the welding source is described, which makes it possible to obtain two fixed welding currents - 150 A and 120 A.

The dimensions and arrangement of the windings of the welding transformer are shown in fig. 18.7.

The windings are wound on two frames made of sheet fiberglass with a thickness of 2 mm. On the frame, the primary and secondary windings are isolated from each other by a 2 mm thick glass-textolite cheek.

Construction of AC welding source
Rice. 18.7. Dimensions, location and connection diagram of the transformer windings

Council. Before winding, the frame should be strengthened by planting it on a wooden mandrel. The hole intended for fitting on the core should be 1,5-2 mm larger than the core, which will subsequently allow you to assemble the transformer without any problems.

Primary W₁ consists of two sections (I and G) located on different frames and connected in parallel. Each section contains 230 turns of wire PEV-2 01,9 mm. If there is a 02,7 mm wire available, then in this case the primary winding will consist of two sections connected in series and containing 115 turns each.

After winding the layer of wire, it should be compacted with light blows of a wooden hammer. If the transformer is made in artisanal conditions, then after winding each layer it must be coated with impregnating varnish. Pressboard 0,5-1 mm thick is used as interlayer insulation.

For secondary winding W₂ a bare aluminum bar with a section of 30 mm2 (5x6 mm) is taken. Before winding, the tire should be tightly wrapped for insulation with keeper tape or thin cotton fabric, previously cut into strips 20 mm wide.

After insulation, the transverse dimensions of the tire should increase by no more than 1,5 mm. The secondary winding, like the primary, is equally distributed on both frames:

sections IIa and IIa' contain 34 turns;
sections IIb and IIb' contain 8 turns of aluminum bus.

The fact that a larger number of turns of the secondary winding corresponds to a smaller welding current is not a typo. The fact is that the voltage of the winding is proportional to the number of turns, and the reactance is proportional to the square of the same value, and therefore the resistance of the winding grows faster than its voltage.

The tire is laid on the wider side and, when properly insulated and laid, there are 21 turns in two layers.

Attention! After winding each layer, it should be compacted with light blows of a wooden hammer and generously smeared with impregnating varnish.

For winding, you can use an aluminum bus of the same section, but with a different aspect ratio. In this case, it may be necessary to slightly adjust the height of the secondary winding section so that an even number of turns enter the two layers.

After winding and impregnation, the transformer should be dried. The temperature and drying time are determined by the brand of impregnating varnish used.

The transformer core is made of cold-rolled transformer steel plates 40 mm wide and 0,35 mm thick.

Cold-rolled steel, unlike hot-rolled steel, which has an almost black color, has a white color.

You can use sheet steel from a decommissioned transformer of a transformer substation. The existing iron is first cut into strips, then cut into fragments 108 and 186 mm long. Burrs on the edges of chopped iron must be removed with a needle file or fine file. The core is assembled "overlapping" with possibly smaller gaps at the joints of individual sheets. The design of the transformer core is shown in fig. 18.8.

Ready, i.e., wound and assembled transformer, must be placed in a protective casing, which should be made of non-magnetic material, such as aluminum or textolite.

Construction of AC welding source
Rice. 18.8. Transformer core design

Attention! Ventilation openings must be provided in the casing. To connect the primary winding of the transformer to the ~220 V network, it is necessary to use a cable with a copper core with a cross section of at least 6 mm2 and a 63 A power socket with a grounding knife, which must be connected to the transformer core and to the protective casing. Accordingly, the grounding contact of the socket must be reliably grounded.

The ends of the secondary winding must be connected to brass studs with a diameter of 8-10 mm, mounted on a dielectric heat-resistant panel, which is attached to the protective casing of the transformer. Soft copper wires with a cross section of 16-25 mm2 can be used as welding wires.

Author: Koryakin-Chernyak S.L.

See other articles Section welding equipment.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Solidification of bulk substances 30.04.2024

There are quite a few mysteries in the world of science, and one of them is the strange behavior of bulk materials. They may behave like a solid but suddenly turn into a flowing liquid. This phenomenon has attracted the attention of many researchers, and we may finally be getting closer to solving this mystery. Imagine sand in an hourglass. It usually flows freely, but in some cases its particles begin to get stuck, turning from a liquid to a solid. This transition has important implications for many areas, from drug production to construction. Researchers from the USA have attempted to describe this phenomenon and come closer to understanding it. In the study, the scientists conducted simulations in the laboratory using data from bags of polystyrene beads. They found that the vibrations within these sets had specific frequencies, meaning that only certain types of vibrations could travel through the material. Received ... >>

Implanted brain stimulator 30.04.2024

In recent years, scientific research in the field of neurotechnology has made enormous progress, opening new horizons for the treatment of various psychiatric and neurological disorders. One of the significant achievements was the creation of the smallest implanted brain stimulator, presented by a laboratory at Rice University. Called Digitally Programmable Over-brain Therapeutic (DOT), this innovative device promises to revolutionize treatments by providing more autonomy and accessibility to patients. The implant, developed in collaboration with Motif Neurotech and clinicians, introduces an innovative approach to brain stimulation. It is powered through an external transmitter using magnetoelectric power transfer, eliminating the need for wires and large batteries typical of existing technologies. This makes the procedure less invasive and provides more opportunities to improve patients' quality of life. In addition to its use in treatment, resist ... >>

The perception of time depends on what one is looking at 29.04.2024

Research in the field of the psychology of time continues to surprise us with its results. Recent discoveries by scientists from George Mason University (USA) turned out to be quite remarkable: they discovered that what we look at can greatly influence our sense of time. During the experiment, 52 participants took a series of tests, estimating the duration of viewing various images. The results were surprising: the size and detail of the images had a significant impact on the perception of time. Larger, less cluttered scenes created the illusion of time slowing down, while smaller, busier images gave the feeling of time speeding up. Researchers suggest that visual clutter or detail overload can make it difficult to perceive the world around us, which in turn can lead to faster perception of time. Thus, it was shown that our perception of time is closely related to what we look at. Larger and smaller ... >>

Random news from the Archive

Subcutaneous chips with COVID-passport 31.12.2021

Several thousand Swedes have implanted implants under their skin in recent years, eliminating the need to constantly carry public transport tickets, a bank card, an electronic key or a business card. Recently, DSruptive Subdermals started using the chips as a COVID passport. This was reported by the agency AFP.

"A chip implant costs 100 euros. If you want to buy a more advanced version, for example, for tracking health indicators, it will probably cost twice as much. But a chip implant lasts 20-40 years," said Hannes Sjoblad, Managing Director DSruptive Subdermals.

Many "consider chips a scary technology," he says, but they should be treated as mere identification tags.

"They don't have a battery, they can't transmit on their own, they can't determine your location," Sjoblad said.

The chip consists of certified biocompatible glass, high-brightness lead-free LED, ultra-thin circuit board with NFC interface, EEPROM. Works with iOS and Android. The chip also has 2 KB of memory, a coil with an inductive ferrite core at a frequency of 13,56 MHz.

DSruptive Subdermals guarantees data retention for 50 years.

Other interesting news:

▪ Miniature Digital MEMS Microphone MP43DT05

▪ Ghost Robotics dog robots to guard the border

▪ Robot troll

▪ Differential probe TEKTRONIX P735

▪ Motion sickness watch

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Fundamentals of safe life (OBZhD). Article selection

▪ article Ovidian transformations. Popular expression

▪ article Why does coffee taste different? Detailed answer

▪ Article Motherwort ordinary. Legends, cultivation, methods of application

▪ article Instead of a microphone - a dynamic head. Encyclopedia of radio electronics and electrical engineering

▪ article Table of conversion factors for AC signals of various forms. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews