Mma Basic Welding Technique - Vector Welding AC/DC WIG 200D Bedienungsanleitung

AC/DC WIG SERIES EQUIPMENT
Welding technique
Parameters of AC TIG(MMA) for Aluinum and its alloy
Tungsten
Welding
Steet Pre-heat
wire
eletrode
thickness Temper
diameter
diameter
/mm /mm -ature/ºC
/mm
1 1.6 2
1.5 1.6~2.0 2
2 2~2.5 2~3
3 2~3 3
4 3 4
5 3~4 4
6 4 5
8 4~5 5 100
10 4~5 5 100~150
12 4~5 5~6 150~200
14 5~6 5~6 180~200
16 5~6 6 200~220
18 5~6 6 200~240
20 5~6 6 200~260
16~20 5~6 6 200~260
22~25 5~6 6~7 200~260
Notice: the above parameters originate from《Welding Dictionary》P538, Volume 2 of Edition 2.

4.5 MMA Basic Welding Technique

Arc Welding Practice
The techniques used for arc welding are almost identical regardless of what types of
metals are being joined. Naturally enough, different types of electrodes would be used
for different metals as described in the preceding section.
Welding Position
The electrodes dealt with in this publication can be used in most positions, i.e. they
are suitable for welding in flat, horizontal, vertical and overhead positions. Numerous
applications call for welds to be made in positions intermediate between these. Some
of the common types of welds are shown
Flat Position,
Flat Position,
Gravity Fillet Weld
Down Hand Butt Weld
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Gas nozzle
Argon flow
Welding diameter
Remark
1
rate/L•min-
current/A
/mm
Flange welding
45~60 7~9 8
Flange or butt
50~80 7~9 8
welding by
one side
90~120 8~12 8~12 Butt welding
150~180 8~12 8~12
180~200 10~15 8~12
180~240 10~15 10~12
V-groove
butt welding
240~280 16~20 14~16
260~320 16~20 14~16
280~340 16~20 14~16
300~360 18~22 16~20
340~380 20~24 16~20
340~380 20~24 16~20
X-groove
butt welding
360~400 25~30 16~20
360~400 25~30 20~22
300~380 25~30 16~20
360~400 30~35 20~22
Horizontal Position, Horizontal-Vertical
Butt Weld
(HV) Position
AC/DC WIG SERIES EQUIPMENT
Vertical Position,
Vertical Position,
Butt Weld
Fillet Weld
Joint Preparations
In many cases, it will be possible to weld steel sections without any special preparation.
For heavier sections and for repair work on castings, etc., it will be necessary to cut or grind
an angle between the pieces being joined to ensure proper penetration of the weld metal
and to produce sound joints.
In general, surfaces being welded should be clean and free of rust, scale, dirt, grease, etc.
Slag should be removed from oxy-cut surfaces.
Arc Welding Technique - A Word to Beginners
For those who have not yet done any welding, the simplest way to commence is to run beads
on a piece of scrap plate. Use mild steel plate about 6.4mm (1/4") thick and a 3.2mm (1/8")
electrode. Clean any paint, loose scale or grease off the plate and set it firmly on the work
bench so that welding can be carried out in the downhand position. Make sure that the work
clamp is making good electrical contact with the work, either directly or through the work
table. For light gauge material, always clamp the work lead directly to the job, otherwise
a poor circuit will probably result.
The Welder
Place yourself in a comfortable position before beginning to weld. Get a seat of suitable
height and do as much work as possible sitting down. Don't hold your body tense. A taut
attitude of mind and a tensed body will soon make you feel tired. Relax and you will find
that the job becomes much easier. You can add much to your peace of mind by wearing
a leather apron and gauntlets. You won't be worrying then about being burnt or sparks
setting alight to your clothes.
Place the work so that the direction of welding is across, rather than to or from your body.
The electrode holder lead should be clear of any obstruction so that you can move your
arm freely along as the electrode burns down. If the lead is slung over your shoulder,
it allows greater freedom of movement and takes a lot of weight off your hand. Be sure the
insulation on your cable and electrode holder is not faulty, otherwise you are risking an
electric shock.
Welding technique
Vertical Position,
Overhead Position,
Fillet Weld
Fillet Weld
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