Taboos and measures for welding construction of steel structures.
Phenomena and hazards
When welding, whether it is bottoming, filling, covering, or regardless of the size of the groove, the same arc voltage is selected. This may not meet the required depth and width of fusion, resulting in defects such as undercutting, porosity, and splashing.
Prevention and control measures
Generally, for different situations, corresponding long or short arcs should be selected separately to achieve better welding quality and work efficiency. For example, for bottom welding, short arc operation should be used to achieve better penetration depth; When filling or covering welding, in order to achieve higher efficiency and melt width, the arc voltage can be appropriately increased.
Not paying attention to controlling the arc length during welding
Phenomena and hazards
During welding, the arc length is not adjusted appropriately based on the groove form, number of welding layers, welding form, and electrode model. Due to improper application of welding arc length, it is difficult to obtain high-quality welds.
Prevention and control measures