Why Do Some Welding Processes Require Argon Arc Welding As A Primer?

Jan 11, 2025

There is no difference in process between full argon arc welding and argon arc welding primer. Full argon arc welding is suitable for thin-walled small-diameter pipes (generally DN60 and below, wall thickness 4mm) to ensure the quality and appearance of the weld root.

When the pipe diameter is large and the wall thickness is thick, argon arc welding should be used for the base welding and manual welding for the cover. The purpose of using manual welding for the cover is that manual welding can ensure the appearance quality when the pipe diameter is large, and the work efficiency is higher than argon arc welding, and the cost is lower than argon arc welding.

The argon arc welding base welding process is used in the welding of water-cooled walls, superheaters, economizers, etc. of boilers. The joint quality is excellent, and the weld grade is above grade II after X-ray inspection.

Advantages of argon arc welding for base welding

(1) Good quality

As long as the appropriate welding wire, welding process parameters and good gas protection are selected, the root can achieve good penetration, uniform penetration, smooth and neat surface. There are no defects such as weld nodules, incomplete penetration, depressions, pores and slag inclusions that are easy to occur in general arc welding.

(2) High efficiency

In the first layer of pipeline welding, manual argon arc welding is continuous arc welding. Electrode arc welding is interrupted arc welding, so manual argon arc welding can increase efficiency by 2 to 4 times. Since argon arc welding does not produce welding slag, there is no need to clean slag and repair welds, so the speed is increased faster. When the second layer of arc welding is applied, a smooth and neat argon arc welding base layer is very conducive to arc welding, which can ensure good fusion between layers, especially in the welding of small diameter pipes, the efficiency is more significant.

(3) Easy to master

The welding of the root weld of manual arc welding must be performed by experienced and highly skilled welders. Manual argon arc welding is used for base welding. Generally, workers engaged in welding work can master it after a short period of practice.

(4) Small deformation

The heat-affected zone is much smaller during argon arc welding, so the deformation of the welded joint is small and the residual stress is also small.

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