Holzmann EISA160-MINI handleiding
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EISA160MINI
15.2 MMA-Welding
1) Stick electrode
2) Coating
3) Metalic core
4) Gas / Slag
5) Arc
6) Weld pool
7) Parent material
The electric arc burns between the workpiece and a consumable electrode. The electrode thus
simultaneously supplies the filler metal. The stick electrode is clamped in an electrode holder and
guided by the welder at the seam. Stick electrodes are generally coated. The coating also melts
before the outside air enters. After the weld pool has cooled, slag is removed.
Almost all weldable materials can be welded with stick electrodes, e.g. structural steel, boiler steel,
tubular steel, cast steel, stainless steel, hardfacing steels, etc.
MMA welding is simple and safe. The compact devices are easy to handle and easy to transport. As
no gas is required, welding can be done outdoors, even in windy conditions.
Welding behaviour and seam appearance are largely determined by the coating. Rutile-coated
and basic stick electrodes are used.
Rutile coated electrodes have a fine droplet material transition and result in fine-flake, smooth and
flat seams. They can be welded to both direct current and alternating current. The slag can be
easily removed, in some cases it is self-dissolving.
Basic coated electrodes can only be welded with direct current (electrode at the positive pole). Due
to the coarser drop transfer, they can be welded well in forced positions. Due to their good gap
bridging properties, they are often used for root welds. Compared to the rutile coated stick
electrodes, the weld is coarser and the slag is comparatively more difficult to remove. With both
types of coating, the arc should be as short as possible.
15.2.1 Choosing the electrodes
Electrode designation according to EN ISO 2560
Codes for the strength and expansion properties of the weld metal
Code
Min. yield strength
Tensile strength
Min. fracture strain
35
355 N/mm²
440 – 570 N/mm²
22 %
38
380 N/mm² 470 – 600 N/mm² 20 %
42
420 N/mm²
500 – 640 N/mm²
20 %
46
460 N/mm² 530 – 680 N/mm² 20 %
50
500 N/mm²
560 – 720 N/mm²
18 %
Codes for the coating types
Type
Coating
Type
Coating
A
acid
RC
rutile cellulose
C
cellulose
RA
rutile acid
R
rutile
RB
rutile basic
RR
thick rutile
C
basic
Codes for the impact energy of the weld metal
Code
Temperature for min. notch impact energy 47J
Z
No requirements
A
+20 °C
0
0 °C
2
-20 °C
3
-30 °C
4
-40 °C
5
-50 °C
6
-60 °C
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Productinformatie
| Merk | Holzmann |
| Model | EISA160-MINI |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 6917 MB |
