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Environmental Effects on site Welding

Environmental Effects on Site Welding - The basic difference between site welding and manufacturing shop welding is the uncontrolled environment at the site. At the site, often only crude, temporary shelters can be justified, usually taking the form of tarpaulins attached to a simple wooden framework to provide a minimum of shelter. Unless welders are provided with a safe and reasonably comfortable working plat form or scaffold, the quality and quantity of work will suffer. Conventional welders uniforms are unsuited to extremes of climate. The helmet, leather jackets, and aprons, are unsuited for the dissipation of body heat in tropical climates.
The necessary freedom of movement is impeded by the usual heavy clothing provided for arctic climates. A possible improvement is the use of lightweight fireproof fabrics for tropical climates, and electrically heated suits, as used in aircraft practice, for arctic conditions.

The need for the acclimatization of welders is another factor emphasizing the advantages of employing and training local labour for site welding. Extremes in environment have their effect on the weld deposit as well as on the operator. In tropical conditions, the problem of maintenance of preheat may be nicely solved, whereas in arctic climates it will be accentuated. In frigid locations, the need for preheat can be minimized by selection of base material and electrodes with low transition temperatures to reduce the hazards of brittle fractures. It has been found that welding of rimmed carbon steel boiler plates in thickness of 25 mm or less can be successfully accomplished with low hydrogen electrodes with preheats as low as 12°F. In contrast to this, preheats of 60°F are required for welding with cellulose coated electrodes. High wind velocities, if there at sites, will considerably affect the welding arcs and hence the weld deposits.

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