18
Packaging type Product consistency and colour
White HD-polyethylene plastic White gel
container (approval according to UN- recommendation)
Pickling Gel for Stainless Steel
Identification: Classifications Shelf life Storage Application data Chemical composition Vol . % Packaging data Protective clothing
13 months when stored in unopened original containers at 0°C. Container should be stored indoors at 0°C.
They should be kept in an upright position with the lids tightly closed.
The storage area should be clearly defined and beyond the access of unauthorised persons. Pickling chemicals are sensitive to high temperatures.
Caution: Storage temperatures higher than 45°C must be avoided since they accelerate the ageing process and destroy the product. Pickling chemicals give best result when they are fresh. Stir the gel to a smooth consistency.
Spread a thick layer on to the work surface using the brush supplied. Allow the gel to remain for 50-90 minutes.
Rinse off the reminding gel using fresh water.
The waste water, after rinsing, contains acids and heavy metals, and must hence be treated according to local wastewater requirements before discharge.
This can be done with neutralising agent or slaked lime.
The waste water treatment should adjust the pH value of the clear water, pH 6,5-10, and precipitate heavy metals into a sludge which should be sent for waste disposal.
Recommended temperature limits for application: 10°C - 40°C. NB. Do not pickle in direct sunlight.
Users should wear rubber boots, protective gloves, rubber apron and face visor.
MSDS available on request .
pH: 0 flamable: No
Do not contain chloride containing agents such as hydrochloric acid (HCL)
ASTM A-380 A1 BS CP-312
Hydrofluoric acid Nitric Acid Binder
(Hf) HNO3
0,5–5 8–0 Rest
Container Net Weight Product No . Containers
Content per container per container per carton
3.01
PICKLING GEL
During welding of stainless steel the weld and the adjacent area to the weld will become exposed to the air at elevated temperature. The result will be oxidation ranging from light tinting to a blue and black scale. A corresponding chromium depletion in the metal below the oxide also occurs. If this is not removed, corro- sion will be the result. Unitor Pickling Gel is used to remove this oxides and the underlying chromium depleted layer. It also removes surface micro slag particles and other contaminates which may cause local corrosion. Pickling restores completely the materials corrosion resistance.
Application
Pickling products are hazardous substanc- es that must be handled with care. The pickling area should be ventilated. Users should wear protective gloves and face visor. Ref.: Material Safety Data Sheet. 1. Pretreat oxides; slag and weld defects
mechanically, preferably when the welds are still warm and the weld oxides less hard.
. Give the area to be pickled time to cool down to below 40°C after welding. 3. Organic contaminants such as grease,
oil and paint have to be removed. 4. Stir the gel to a smooth consistency
and spread a thick layer on to the work piece using the brush supplied. 5. The work piece should be cold when
the gel is applied, although the air tem- perature must not be below + 5°C (41°F). Do not pickle in direct sunlight. 6. The gel should be allowed to remain
for at least 50 minutes. For Mo-alloyed steels this time should be extended. If necessary the gel may be allowed to remain on the work piece over night as there is no risk for corrosion.
7. After appropriate time, rinse off the reminding gel using fresh water. If nec- essary brush the weld with a stainless steel wire brush.
8. Pickling residuals and rinse water should be neutralised to pH-7 i.e. with Neutralising Agent, and then rinsed with water. For the deposit of heavy metals, local water pollution control regulations should be consulted
9. The bottles must be stored in an upright position with the lid tightly closed. Storing temperature 0°C. Storage temperature higher than 45°C must be avoided since this accelerate the age- ing process.
Stir the gel before use
Apply with the brush
Leave the paste to work
Remove with water
Discoloration/oxidation of surface Weld
Chromium depletion
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184
NIfE-334 N
Nickel Iron Electrode for Cast Iron
Classifications Approvals Type of current Welding positions Materials to be welded
All weld metal composition
Typical mech . properties of weld metal Packaging data Welding data
AC
DC+/-
PA PB PC PF PG PE, PDFor welding and repair DIN 1691 DIN 1692 DIN 1693
G G 10 GTS-35-10 G GG-40 G G 15 GTS-45-06 G GG-50 G G 0 GTS-55-4 G GG-60 G G 5 GTW-35-04 G G 30 GTW-40-05 G G 35 GTW-45-07 GTW-S 38-1 Imprint
Unitor NIFE-334 N / NiFe-C1
SfA/AWS A5 .15 EN-ISO 1071
E NiFe-CL-A E NiFe-CL-A1
Diameter Length Electrodes Net weight Product No . Boxes
mm . mm . per box per box per box per carton
3. 350 68 . 096-69951 6
4.0 350 51 .4 096-69950 6
Re-drying temperature: 00 °C (39 °F) for two hours.
Diameter Current Arc time **/ Deposition rate** Electrodes per fume class* mm . range, A electrode, sec . Kg/h kg weld metal** Danish Std .
3. 75–100 90 0.9 45
4.0 85–160 70 1.8 30 3
* MSDS available on request. ** 90% of max. amperage
Tensile strength yield strength Elongation Hardness
MPa MPa % HB
375 300 1 180
Ni fe C
47.0 - 56.0 4.0 - 48.0 1.4 - .0
3.01
NIfE-334 N
The Unitor NIFE-334 N electrode has been specially developed for cold welding of different types of cast iron especially nodular cast iron, mal- leable cast iron and grey cast iron. The cold welding process is normally used on large, complicated cast iron parts where the use of heat would involve considerable risk of trans- verse fractures. In the cold welding process, the heat transfer to the base material is kept to a minimum by welding only very short beads (–3 cm) at a time, the bead being peened and allowed to cool before welding the next bead. Smaller parts may be hot welded i.e. preheated to approx. 500°C and continuously welded. The weld metal is easily machineable. Prepare the damage area in the fol- lowing manner:
– Use crack detector to find the end of the crack fracture.
– Drill a hole at the end of the crack, using a 3 mm drill, to prevent fur- ther fracturing during welding. The same welding procedure applies as for Nickel-333 N.
When welding oily cast iron, Unitor electrode CH--38 should be used to prepare the grooves. This is a special electrode for gouging without the use of oxygen. As well as forming a suitable welding groove, this process also burns out the oil contained in the carbon flakes, which are present in all types of cast iron. If the oil is not burnt off, it will have a tendency to surface during welding and form pores in the deposit.
After gouging with Unitor CH-2. The oily deposits in the welding area have evaporated.
Large complicated parts should be cold welded.
Smaller parts, free to expand, may be hot welded. NB: Allow to cool off slowly.
A crack in cast iron. The carbon flakes in the metal are saturated with oil.
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186