Distinctive properties of an inverter type welding machine are its low weight, compact dimensions and high performance.
When working with a welding inverter it is necessary to monitor the continuity and quality of the weld.
By following the manual and fulfilling the basic requirements of the instructions, you will be able to independently master the welding technique of this unit. After purchasing and checking the completeness of the equipment, the next stage of work will be the process of connecting the welding inverter.
Welding Machine Connection Guide
Control circuit welding inverter.
Before you begin to study the instruction manual of the welding inverter and learn the technique of welding, you need to understand how and where you can connect the unit. First, examine the wiring and sockets in your home. If the house is built long enough, then the sockets and wires installed in it are designed for a maximum current of 10 A.
The instruction manual of the device in question requires an extremely serious approach at all stages. Violating the requirements for connecting the unit to the network, you risk leaving yourself and your nearest neighbors without electricity.
As a rule, the length of the power cord of the welding inverter does not exceed 2-2.5 m. Therefore, when working, you will need extension cords. The operating instructions require the use of appropriate extension cords. The maximum allowed current depends on the wire cross section. So, if the cross section is 1.5 mm², then you can work on a current of not more than 16 A. Wires with a cross section of 2.5 mm² can withstand a load of 25 A.
The wire size of the extension cord to connect the welding inverter must be selected with a margin. For safety reasons, grounding is recommended. Extension of the wire is best done without intermediate connections. Purchase a stranded solid cable of suitable length. The cable with a cross section of 35 mm² can operate at a maximum current of 140 A.Back to table of contents
Getting started with a welding inverter
Welding inverter classification table.
Before using the inverter type welding machine, you need to prepare the following:
- Safety glasses and headgear.
- Gloves from dense material. Rubber products are not suitable.
- Overalls from dense rough material.
First you need to select the electrode and adjust the welding current. Operation of the welding inverter involves the use of electrodes with a diameter of 2-5 mm. Set the welding current in accordance with the thickness of the materials to be welded and their composition. As a rule, suitable current values are given directly on the housing of the welding inverter. Bring the electrode to the treated surface slowly, you can not hurry, because this leads to sticking. Next, you need to connect the ground terminal to the surface.
Directly welding process with the help of an inverter begins with the ignition of the arc. It is necessary to bring the electrode to the workpiece at a small angle, then touch the welding surface several times. This will activate the electrode. Keep the electrode away from the workpiece. Usually kept at a distance equal to the diameter of the electrode used.
Boil until a seam of the desired length is obtained. Metallic scale on top of the seam is removed with a small hammer or other suitable object.Back to table of contents
How to control the arc gap?
The control circuit of the arc gap.
In the process of using a welding inverter, you will encounter such a phenomenon as an arc gap.
It is necessary to understand the gap formed in the process of welding between the metal surface and the electrode of the welding inverter. It is important to maintain this gap on one value.
If the gap is small, you will get a convex seam with areas of non-fusion on the sides. This phenomenon is caused by the fact that the metal does not have enough time to warm up. If the gap is too large, the arc will begin to gallop. This will cause the unevenness of the deposited metal.
By maintaining the gap at a constant and suitable size, you will form a normal seam with high-quality penetration. To ensure high quality welding can only learn how to control the length of the arc.Back to table of contents
Instructions for creating the correct weld
The profile of the weld.
When working with a welding inverter, everything must be done in accordance with the technology, otherwise various defects will appear. The bath line during welding is below the surface of the base metal.
The formation of a seam occurs under the influence of the arc, when it deeply and intensively passes into the base metal and pushes the bath back. Therefore, when performing welding work, the master must ensure that the seam is located at the metal level. To create the perfect seam you need to use zigzag and circular movements. When performing circular motions, watch the level of the weld. Bath should be evenly distributed in a circle.
If you will create a zigzag seam, control its formation first on one side, then on top of the bath, then on the other side, etc. Remember that the bath follows the heat.
If the electrode metal is not enough to fill the tub, an undercut is formed in the process of moving across. To exclude the appearance of such a groove, control the outer limits and carefully monitor the bath. If necessary, its thickness can be reduced.
The bath is manipulated by the force of an arc located at the end of the working electrode. If you tilt the electrode, the bath will push, not drag. The more vertical you hold the electrode during operation, the less convex the resulting seam will be. When the electrode is placed vertically under it, all the heat will be collected. This will allow you to press the bath down, melt it well and spread everything around.
With a slight inclination of the electrode, you will direct the force back. Because of this, the weld seam rises. Tilting too much will not control the bath normally.
If you need to move the bath back or get a flat seam, the electrode should be tilted at a different angle.
Start working at an angle of 45-90 °. Such angles make it possible to properly monitor the bathroom and do the work.Back to table of contents
Nuances of welding thin sheet metal
Welding of such products has its own characteristics. First you need to understand the polarity of the electrodes. During the work with the welding inverter on a direct current the positive and negative charge takes place. First you need to understand where each charge is connected. So, if you connect a positive charge to the material being welded, it will warm up more. If it is connected to the electrode, it will burn more and heat up.
- When working with thin sheet metal products, reverse polarity is usually used. So, the electrodes are connected plus to the arc of the apparatus. The minus is on a sheet of metal.
- Keep the electrode at a minimum distance from the part to be welded. Wait until the red spots appear. A drop of molten metal will appear below it, connecting the sheets to be welded. Then you will only have to carefully and slowly lead the electrode along the surface of the blanks. Formed during this drop will create a seam connecting the sheets to each other.
Thus, it is not so difficult to work with a welding inverter. Having completely understood the main points of the instruction and unswervingly following the established requirements, you will be able to do everything no worse than a qualified welder. Have a good job!