1 Find answers to the questions:

1. When was MIG welding developed?

2. How does MIG welding work?

3. How many main components do MIG welders have? What are they?

4. What is the name of the power source used for MIG welding?

5. What is the MIG gun?

2 Complete the sentence according to the text.

MIG welding is commonly used …

a) to produce a weld.

b) in welding aluminum.

c) in one direction.

d) in shops and factories.

BUSINESS ACTIVITY

Match the parts of the envelope (1-6) with the explanations (a-f).

Barrie Welding & Machine 39 (1) Anne St. South (2) Barrie ON, (3) L4N 2C7 Canada (4) Mr. Rivas Manager of (5) American Welding and Gas (6) 6944 S. Pulaski Road Chicago, IL 60629 U.S.A.

a) the town the letter comes from

b) the house number in the mailing address

c) the ZIP code in the return address

d) the addressee’s company name

e) the street name in the return address

f) the addressee

Text 5 Welding Flux

Flux plays a vital role in virtually all welding processes. Use of the wrong flux or a poor application technique can have a dramatic effect on joint quality.

There are also special fluxes for brazing tungsten carbide, stainless steel brazing, induction brazing, brazing aluminum bronze, manufacturing flux coated rods, reducing red staining on brass and brazing refractory metals.

Flux10

A powder flux for brazing and welding aluminum. A premium formula flux. Active in a range between 1080 ºF and 1140 ºF. The powder turns to a clear liquid when the proper brazing temperature has been attained. Can also be used as a paste.

Flux11

A powder flux for brazing cast or malleable iron with bronze rod. Flux11 is active between 1500 ºF and 2000 ºF. Joints are bright, clean, strong and free from porosity, owing to the scavenging action of the flux. Applications include industrial equipment, marine engines, and maintenance.

Flux14

A powder flux for welding aluminum and aluminum based alloys in sheet, extruded and cast forms. It is especially designed for welding 52-S, 53-S and the pure 2-S aluminum sheet employed in aircraft. This flux melts at 1060 ºF and has a useful range up to 1200 ºF. The flux is an excellent solvent for aluminum oxide and promotes strong weld joints free of oxide inclusions. Applications include aircraft, HVAC, home building and maintenance.

Flux17

A high temperature flux, works very well with ferrous metals, stainless steels, carbides and specialty alloys containing refractory oxides. Applications include carbide tools, industrial equipment, mining tools, fire extinguishers, jobs involving large parts and long heating cycles.

Flux52

A salt type flux used on zinc die castings, pot metal and DOW metals.

Flux505

A liquid flux for soldering with all soft solders. Use Aufhauser 505 (neutral) flux with any commercial lead-tin, tin-silver, tin-antimony soft solders. It is a general purpose, neutral, "noncorrosive" soldering flux for use on electrical devices, electronic parts, concealed joints, and for items where corrosion cannot be tolerated. It is active between 300 ºF and 500 ºF.

Flux600

A white granular powder flux. Works well on ferrous, non-ferrous alloys and stainless steels and is most suitable for use with low fuming bronze (C681) filler metal. Entirely free of fluorides, with a high boric acid content which permits the flux to stick to hot filler metal rods. It is active in a heat range between 1400 ºF to 2200 ºF.

Flux800

A powder flux for gas-welding cast iron with cast iron rod. The flux keeps the welding puddle clean and promotes the formation of non-porous, dense and uniform weld joints that are machinable. Applications include engine repair and general maintenance.

Flux900

A powder flux for brazing and welding magnesium. Use with Aufhauser AZ61A and AZ92A magnesium alloys. Aufhauser Flux900 is a special salt-powder flux formulated for magnesium. Active heat range is 950 ºF to 1300 ºF. It may be mixed with water or alcohol to form a paste. The residue may be removed with warm water.

Stainless Steel Flux

A powder flux for gas-welding stainless steels and other chromium-nickel alloys. Especially formulated for welding both the 300 and 400 series of stainless steel. Promotes excellent weld joints; the glassy residue is self cleaning, exposing clean and bright metal. Applications include industrial equipment and maintenance.

Backside StainFlux

A powder flux used on the back-side of stainless steel, with MIG or TIG welding. It is designed to take the place of an argon purge or ceramic backup tape. This flux increases weld penetration, reduces oxide inclusions, and significantly improves the quality of the weld. Applications include appliances, food and restaurant equipment, paper-making machinery, and maintenance.

High Production Welding Flux

SpeedFlux B2

Boron infused, high speed automation liquid flux for braze-welding steel and other metals with bronze rods, nickel-silver rods and silver solders. Flux is dispersed through the flame. Applications include all-surface brazing applications, building up shafts and spindles, automotive, sculpture, jewelry, HVAC and general maintenance.

SpeedFlux LPG

Similar to the B2, but is intended for use with all liquefied petroleum gas systems such as MAPP and others.