Taboos and Measures for Welding Construction of Steel Structures

Taboos and measures for welding construction of steel structures in Guangxi

Phenomenon and harm

When welding, select the same arc voltage regardless of the size of the bottom, fill, cover, and groove. In this way, the required penetration depth and penetration width may not be satisfied, and defects such as undercuts, pores, and splashes may occur.

prevention

Under normal circumstances, the corresponding long arc or short arc should be selected according to different conditions to obtain better welding quality and work efficiency. For example, under welding is to obtain better penetration, short arc operation should be selected; fill welding or cover welding is to obtain higher efficiency and melting width, and the arc voltage can be appropriately increased.

Do not pay attention to controlling the arc length when welding

Phenomenon and harm

When welding, the arc length was not adjusted properly according to the groove method, the number of welding layers, the welding method, the type of welding rod, etc., due to the improper application of the welding arc length, it is difficult to obtain high-quality welds.

prevention

In order to ensure the welding quality, short arc operation is generally used during welding, but the appropriate arc length can be selected according to different conditions to obtain good welding quality. For example, a layer of V-groove butt joints and corner joints should be used. A shorter arc to ensure penetration without undercut; the second layer can be slightly longer to fill the weld. If the welding gap is small, a short arc should be used. When the gap is large, the arc can be slightly longer and the welding speed will increase. The arc of overhead welding should be short to avoid the flow of molten iron; in order to control the temperature of the molten pool during vertical and horizontal welding, small current short arc welding should also be used. In addition, no matter what welding method is used during the movement, the arc length must be kept basically unchanged at all times to ensure that the weld width and penetration depth of the entire weld are the same.

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