Campbell Hausfeld specifications Modelo WS2800, Arc Welding Basics

Operating Instructions and Parts Manual

Shielded Metal Arc Welder

Modelo WS2800

When current (amperage) flows through the circuit to the electrode, an arc is formed between the end of the electrode and the work piece. The arc melts the electrode and the work piece. The melted metal of the electrode flows into the molten crater and forms a bond with the work piece as shown.

		Wire
Slag		Flux
Weld	Work piece
Figure 9	- Weld Components	Crater

Note: Discontinue using and discard electrodes that burn down to 1 to 2 inches from the electrode holder.

Striking an Arc

Place the bare end of the electrode in the holder. Grip the holder lightly to reduce tiring of the hand and arm.

Note: Always keep the jaws of the holder clean to insure good electrical contact with the electrode.

electrode is brought straight down and tapped on the work piece.

With the scratching method, drag the electrode at an angle along the surface much like striking a match. Regardless of method, upon contact with the plate, immediately raise the electrode a distance equal to the diameter of the electrode or it will stick to the surface. Always hold the electrode pointed into the weld.

Note: Should the electrode stick to the work piece, break it loose by quickly twisting or bending at the holder while pulling upward. If the electrode does not break loose, disengage the electrode by releasing it from the holder.

Arc Welding Basics

Five basic techniques affect weld quality. These are: electrode selection, current setting, weld angle, arc length, and travel speed. Proper implementation of these techniques is necessary for good weld quality.

Electrode Type and Size

The correct choice of electrode type involves a variety of factors, such as welding position, work piece material type, thickness, and condition of

majority of arc welding is done with the electrodes in the mild steel group. The electrode material should corres- pond with the work piece material.

Flux coatings are made for use with either AC (alternating current), DC (direct current) reverse polarity, or DC straight polarity, although some function well on both AC and DC current.

Commonly Used Electrodes

1. E-6011 Deep Penetrating

•The strong arc force and rapid solidification of the metal makes vertical and overhead welding easier with this rod.

•Where time does not permit rust, scale or paint removal, this rod penetrates rapidly and easily.

•Acceptable for AC or DC welding current (reverse polarity).

2. E-6013 General Purpose

•All position, smooth deposit rod with low spatter.

•For all mild steel and general purpose work.

•Acceptable for AC or DC welding current (straight or reverse polarity).

paso para soldar. Primero deberá hacer un paso primordial, éste será seguido por pasos adicionales de relleno (vea la Fig. 8 y 9). Si las piezas son gruesas, tal vez sea necesario biselar los bordes que están unidos en un ángulo de 60º .

Recuerde que deberá limpiar las escorias antes de cada paso.

Be careful not to

! WARNING touch the work piece or welding bench with the electrode as this causes arc flashes.

There are two methods which can be used to start or strike the arc; the tapping method and the scratching method. In the tapping method, the

Same as

electrode diameter

Same as

electrode diameter

Figure 10 - Striking An Arc

surface to be welded. The American Welding Society, AWS, has set up certain requirements for each type of electrode.

All electrodes are classified into five main groups: mild steel, high-carbon steel, special alloy steel, cast iron, and nonferrous such as aluminum. The

AWS Electrode Classification

E - 6 0 1 3

E = Electrode

60= Mild steel

70= High strength Steel

1= Electrode can be used in all positions

2= Electrode is restricted for use in flat or horizontal position only

Flux type

3. E-7014 Iron Powder

•A general purpose "drag" rod for all positions.

•Ideal for situations where fit between metal pieces is poor.

•The iron powder in the flux coating combines with the filler rod to make a smooth deposit with very little spatter.

•Ideal for ornamental work.

•Acceptable for AC or DC welding current (reverse polarity).

4. E-7018 Low Hydrogen

•An all position high strength electrode designed to produce low hydrogen content combined with excellent mechanical properties.

•Acceptable for AC or DC welding current (reverse polarity).

Nota: El ancho (A) del reborde debe ser aproximadamente el doble del diámetro de la varilla de electrodo que se use.

Corriente, longitud del arco y velocidad normales

Corriente muy baja

Corriente muy alta

Figura 14 - Apariencia de la soldadura

Metal Básico

Velocidad muy rápida

Velocidad muy lenta

Longitud del arco muy larga

Longitud del arco muy corta

www.chpower.com

6 35