Maximum Wind Velocity at site of Welding
GMAW , GTAW , EGW, or FCA W-G shall not be done in a draft or wind unless the weld is protected by a shelter. Such shelter shall be of material and shape appropriate to reduce wind velocity in the vicinity of the weld to a maximum of 5 miles per hour [8 kilometers per hour]. So, the wind velocity shouldn’t be more than 5 miles per hour or 8 kilometers per hours as specified in AWS D1.1.
Other welding codes such as ASME or EN/ ISO are silent on exact maximum wind velocity. Rather, these standards call for welding conditions protected from direct air drought.
Minimum Ambient Temperature for Welding
Any Welding work should not be done at following weather conditions pertaining to temperature:
- When the ambient temperature is lower than 0°F [-20°C], or
- When surfaces are wet or exposed to rain, snow, or
- High wind velocities, or
- When welding personnel are exposed to inclement conditions.
NOTE: Here Zero°F does not mean the ambient environmental temperature, but the temperature in the immediate vicinity of the weld. The ambient environmental temperature may be below 0°F [-20°CJ, but a heated structure or shelter around the area being welded may maintain the temperature adjacent to the weldment at 0°F [2- 0°CJ or higher.
Does SMAW safe to carry out in open area, Is it safe to weld in windy?
In SMAW process, the shielding gases are produced by the burning of electrode coating. The gases produced due to intense burning heat exert a high gas pressure, those makes SMAW least prone to wind effects on welding arc. Although, too high wind can make the welding arc unstable due to improper gas blanket. So, SMAW also shouldn’t be done in high windy surrounding.
What about Gas Shielded Metal Arc processes?
Gas Shielded Metal Arc processes such as GMAW- MIG & MAG and FCAW use externally supplied shielding gases. These gases provides a basic gas shielding without a strong shielding effect like in SMAW. Hence, they are easily loose their gas shielding blanket if exposed in high windy conditions. Thus, GMAW & FCAW should be carried out in-house or when proper blankets or welding area coverage is available on the sites.
in GMAW & FCAW, the gas shielding at the point of welding is to be protected from the wind to prevent interruption in shielding and resulting contamination of the weld by the atmosphere.