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Types of welding

Types of welding

Arc welding is a type of welding that uses a welding power source to create an electric arc between an electrode and the base material to melt the metals at the welding point. They can use direct current (DC) or alternating current (AC) and consumable or non-consumable electrodes.

Types of welding

Before starting real arc welding, the operator must be fully aware of the hazards involved. High temperature arc and hot metal can cause severe burns. In addition, the electric arc itself represents a danger to health and safety.

When welding with the electric arc, there is an additional danger that small globules or drops of molten metal can leave the arc and fly in all directions. These sparks vary in temperature from 2000 ° to 3000 ° Fahrenheit and in size from very small to as large as ¼ inch. They present a risk of personal burns plus a risk of fire if they fall on flammable material.

The welding operator needs to protect himself, through a helmet and other protective devices against the arc's harmful rays and flying sparks. The filter plates in the welding helmet will eliminate 99% of the harmful rays if the appropriate shadow lens is used.

Other hazards associated with electric arc welding are:

Electric shock, which can be caused by standing in damp areas, welding without gloves, bare wires, uninsulated support, welder in wet conditions, etc.

Harmful fumes: emitted in the welding process, especially when welding on galvanized materials or other coated materials.

The operator must be adequately trained with all safety precautions and be careful to protect themselves properly at all times against any danger associated with arc welding using protective clothing and equipment, working in dry conditions, providing adequate ventilation and, in general, using common sense.

The following is a list of safety precautions that must be observed in the use of arc welding equipment:

a) Arc welding Electric shock:
1) Make sure the machine is properly grounded.

2) Ensure that the return grounding current is drawn from the same place that is allowed for welding.

3) Adequate indicator of the welding cable to be used as the return ground current.

4) portable ovens and other parked ovens must be properly grounded.

5) The welder must be in a "dry" physical condition during the course of welding.

6) Never allow "live" parts of the electric welding machine to touch bare skin or wet clothing.

7) Do not cool Emerson electrode holders in water.

8) Turn off the power supply when welding activity is not in use.

9) Do not stand on wet areas while charging.

10) Wear leather gloves.

11) Make sure the cable is covered and in good condition.

12) Ensure that the electrode holders are properly insulated.

B) Arc welding Burns:

1) Protect the eyes and face from flying slag particles by using a suitable welding shield.

2) wear appropriate protective clothing.

3) Always wear leather gloves.

4) wear high shoes.

5) keep the collar, shirt pockets, etc. buttoned

6) Do not touch the electrode or metal where welding was performed.

7) Handle hot metal with stackers or tongs.

8) Keep the electrodes disposed of properly.

C) Arc welding Radiant Energy (Ultra violet rays etc..)

1) Wear a welding helmet with the correct shaded welding lenses in good condition.

2) Wear appropriate clothing, do not leave bare skin exposed to arc rays.

3) Do not hit the bow without covering the face and eyes. Warn others before hitting the bow.

4) Avoid looking directly at the arc where others are welding without adequate eye protection.

D) Arc welding Gases & Fumes

1) Work only in well ventilated areas.

2) Be very careful when working on metals covered with lead or zinc, see MSDS (Material Safety Data Sheet)

3) If working in a confined area ensures adequate ventilation before starting welding, also use a suitable respirator or other approved breathing devices depending on the nature of the job.

E) Arc welding Combustible materials

1) Keep the store clean in the area where it will be welded.

2) Do not weld near combustible materials of any kind.

3) Never weld in covered containers that may have contained fuel and may explode.

F) Arc welding Fire Protection

1) Be familiar with the location and types of fire extinguishers.

2) Report any unsafe conditions that may start a fire.

3) Do not weld near flammable materials.

4) Ensure sufficient clearance before welding near electrical connections or lines, follow LOTO (Lockout / Tagout)

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