Lincoln Electric SVM208-A service manual Vertical-Up Welding, Vertical-Down Welding

B-14 OPERATION B-14

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Vertical-Up Welding

The problem, when welding vertical-up, is to put the molten metal where it is wanted and make it stay there. If too much molten metal is deposited, gravity will pull it downwards and make it “drip”. Therefore, a certain technique has to be followed:

Long arc

Short arc

NOTE: Holder end of electrode is lower than arc.

1.Use 1/8” (3.2mm) 90-115 amps or 3/32” (2.5mm) 70 amps AWS 6011.

2.When welding, the electrode should be kept hori- zontal or pointing slightly upwards. (See drawing above).

3.The arc is struck and metal deposited at the bottom of the two pieces to be welded together.

4.Before too much molten metal is deposited, the arc is SLOWLY moved 1/2-3/4” (12-20mm) upwards. This takes the heat away from the molten puddle, which solidifies. (If the arc is not taken away soon enough, too much metal will be deposited, and it will “drip”.)

5.The upward motion of the arc is caused by a very slight wrist motion. Most definitely, the arm must not move in and out, as this makes the entire process very complicated and difficult to learn.

6.If the upward motion of the arc is done correctly with a wrist motion, the arc will automatically become a long arc that deposits little or no metal. (See drawing above.)

7.During this entire process, the ONLY thing to watch is the molten metal. As soon as it has solidified, the arc is SLOWLY brought back, and another few drops of metal are deposited. DO NOT  FOLLOW

THE UP AND DOWN MOVEMENT OF THE ARC WITH YOUR EYES. KEEP THEM ON THE MOLTEN METAL.

8.When the arc is brought back to the now solidified puddle, IT MUST BE SHORT, otherwise no metal will be deposited, the puddle will melt again, and it will “drip”.

9.It is important to realize that the process consists of SLOW, DELIBERATE movements. There are no fast motions.

Vertical-Down Welding

Vertical-down welds are applied at a fast pace. These welds are therefore shallow and narrow, and are excel- lent for sheet metal. Do not use the vertical-down tech- nique on heavy metal. The welds will not be strong enough.

1.Use 1/8” (3.2m) or 3/32” (2.5mm) AWS 6011.

2.On thin metal use 70-75 amps.

(14 ga. 75 A - 16 ga. 60 A.)

3.Hold the electrode in a 30-45° angle with the tip of the electrode pointing upwards.

4.Hold a VERY SHORT arc, but do not let the elec- trode touch the metal.

	Very
5. An up and down whipping	short
motion will help prevent	arc
burn-through on very thin plate.	30°-40°

6. Watch the molten metal carefully.

The important thing is to continue lowering the entire arm as the weld is made so the angle of the electrode does not change. Move the electrode fast enough so that the slag does not catch up with the arc.

BULLDOG® 140