Perforated Round Tube

Perforated Round Tube are mainly used for filtration. We offer a variety of designs and materials to fit your specific requirements. For its practical and aesthetic features, perforated metal has many potential uses in industries as well as in architecture.

Perforated Round Tube --Spiral Lock Seam

Steellong offers two seam designs on the perforated spiral tubes: the flush (outside) and inside lockseam. The flush lockseam tube is the most commonly used tube in the fluid filtration industry mainly as a centertube in the filter housing. It is available in thickness of .010” to .022”. The inside lockseam tube is also used as a center tube and available in thickness of .024” to .035”.

Perforated Round Tube-- Primary Applications

Filtration
Exhaust Systems

Perforated Metal tubes -- Material Options

Galvanized Steel
Stainless Steel
Brass
Aluminum

Plug Welding and Spot Welding

Spot welding is a process in which contacting metal surfaces are joined by the heat obtained from resistance to electric current flow. Work-pieces are held together under pressure exerted by electrodes. Typically the sheets are in the 0.5-3.0 mm thickness range. The process uses two shaped copper alloy electrodes to concentrate welding current into a small "spot" and to simultaneously clamp the sheets together. Forcing a large current through the spot will melt the metal and form the weld. The attractive feature of spot welding is a lot of energy can be delivered to the spot in a very short time. That permits the welding to occur without excessive heating to the rest of the sheet.
The amount of heat (energy) delivered to the spot is determined by the resistance between the electrodes and the amplitude and duration of the current. The amount of energy is chosen to match the sheet's material properties, its thickness, and type of electrodes. Applying too little energy won't melt the metal or will make a poor weld. Applying too much energy will melt too much metal and make a hole rather than a weld. Another attractive feature of spot welding is the energy delivered to the spot can be controlled to produce reliable welds.

Plug welds and slot welds are used join overlapping members, one of which has holes (round for plug welds, elongated for slot welds) in it. Weld metal is deposited in the holes and penetrates and fuses with the base metal of the two members to form the joint. (Note: for the sake of graphical clarity, the drawings below do not show the penetration of the weld metal. Recognize, however, that the degree of penetration is important in determining the quality of the weld.) For plug welds, the diameter of each plug is given to the left of the symbol and the plug-to-plug spacing (pitch) is given to the right. For slot welds, the width of each slot is given to the left of the symbol, the length and pitch (separated by a dash) are given to the right of the symbol, and a detail drawing is referenced in the tail. The number of plugs or slots is given in parentheses above or below the weld symbol. The arrow-side and other-side designations indicate which piece contains the hole(s). If the hole is not to be completely filled with weld metal, the depth to which it is to be filled is given within the weld symbol