The Complete Guide to Welding Technology: Welding Types, Process Control, and Equipment Selection Applications

Characteristics of Different Welding Types

1. AC welding:
   Its simple power source that control the conduction angle by AC current, is generally best suited for easily suitable stainless steel material. However, it has relatively poor thermal efficiency which can lead to a larger heat result the work-piece be dark. For this reason, it is not ideal for high-precision welding applications.
2. DC Inverter welding:
   No current stop time, and it can continuously provide heat energy, with advantages such as high thermal efficiency, short welding time, small heat impact, and suppressed power loss. High-speed welding control can prevent spatter, stabilize welding quality, and is suitable for high-precision welding. Application: Copper, Aluminum and Nick materials.
3. Capacitive Discharge welding:
   Pre-charging current into the the capacitor and then releasing by on time. It current rises rapidly, the release angle is difficult to control, and spatter is easily generated. Before the next cycle of welding, the capacitor must be allowed to recharge.
4. Flash Butt Welding:
   A resistance welding process used to join thick metal plates/files or bars end-to-end. It works by applying opposing forces directly with electrodes that clamp the work pieces. After the work pieces are heated, a extrusion welding operation is applied.
5. Seam Welding:
   It is primarily used for continuous welding of thin metal sheets. To use two rolling wheels, one above the other, to apply pressure to the work piece and continuity weld them together through the passage of an electric current. Such as: water tank, transformer of radiator plate, and steel fuel tank...etc.

Which basically condition will decide welding successful?

1. Welding Current: To avoid excessive current can cause expulsions and weld electrode damage.
2. Welding Time: Both a suitable time and a correct welding current are basic condition for a good weld.
3. Welding Force: Proper suitable pressure on workpiece, ensuring smooth current flow and good contact. Incorrect force leads to poor weld quality.
4. Electrode Shape: It dictates current and pressure distribution which in turn impacts weld strength, consistency, and appearance.

How to determine a successful spot weld using destructive tests?

1. Tensile test: Measure the strength force required on the break weld area.
2. Bend test: To test component performance by bending the welded part. By destructive tests on the parts, you can make sure the optimal weld parameters for the work pieces.

How To Selection A Suitable Welding Machine

1. Consider the work piece material and combination to decide the suitable weld equipment.
   Evaluate the work piece dimension and material to decide the safety KVA rate and the style of the welding machine.
   To discuss the end user’s requirement which will more accurate to choosing the right welding machine.
2. What is a Welding Transformer?
   2.1 It use electromagnetic induction to convert high-voltage low-current into low-voltage high-current.
   2.2 This is AC Power into primary coil creating a magnetic field then converts much higher current in the secondary coil.
   2.3 The secondary coil connected to the welding electrodes which will output the welding current to heat and fuse the metal.
3. What are the main components of a welding transformer?
   3.1 Iron core: To provides a common magnetic path for the windings which often made of high-efficiency stacking laminated silicon steel thin sheets. This itme is responsible for directing the magnetic flux from the primary to the secondary winding.
   3.2 Primary winding: This is the high-voltage, low-current winding coil which is main input power position. It consists of many turns of insulated copper wire.
   3.3 Secondary winding: It made of a few turns of very thick copper plate to bear the high welding current.
   3.4 Cooling system: The high welding current and heat generated, a perfect design for cooling circuit which is crucial for dissipating heat and maintaining the transformer's using life.
4. What is different for each welding transformer?
   AC type, DC type, Inverter type and three phase rectifier type