This paper attempts to study safety and exploitation conditions of long weld steel structures. To study the effects of the long structure flexibility and resistance, the structure been welded by steel covered electrodes with varied amount of Mo. The most significant of factors influencing that conditions are connected with material choice, welding technology, state of stress and temperature. Because of that a good selection of steel and welding method is crucial to obtain proper steel structure. Shielded metal arc welding (SMAW) also known as manual metal arc welding (MMA) is a very popular method of welding used for structure reparation. Very often SMAW could be also treated as main montage process.Keywords: Long weld steel structures, steel covered electrodes with varied amount of Mo, Shielded metal arc welding (SMAW)
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