Repairing a Broken Bandsaw Blade

If you use a bandsaw for any one of a number of reasons and the blade happens to snap, this can be inconvenient especially if you do not have a spare. This can also mean that you are either up for the cost of a new blade or you may be able to find someone who has a band saw blade welder to fix it for you.

This welding machine has been especially adapted and designed for repairing these particular cutting devices. The snapped blade is placed in the machine and goes through a number of processes which repairs it, before it is finally removed and ready to be reused again.

There are several different sizes to be found for purchasing and these can be from the larger ones to the much smaller versions down to the portable units. For those who have a backyard shed or garage where they like to use a bandsaw, then the portable type will run off a car battery which is twelve volts making it ideally suited to this situation.

These cutting devices can be tricky to weld with an ordinary type of welding unit as there can be a problem with the heating and cooling of the metal being repaired. It usually requires a process of annealing which is a method of heating then slow cooling to help reduce any brittleness, but also toughens the metal helping the join to last.

The large units are often used in a company or business where there are a number of bandsaw cutting machines, and are much better suited to this situation than the smaller portable unit. The portable variety is ideal for moving to a machine with a break, in a backyard or any other type of situation.

Single alloy blades are the type most suited to fixing in some of these machines as they are not as hard to weld as some of the other metals such as the bi metal type. The bi metal type will sometimes re break where they have been fixed and this machine is not always recommended for this type of blade.

For those companies and business which have the much larger workshops with several band saws, to those who have a garage or backyard workshop where they use a band saw this unit would make a ideal addition for making repairs. If looking for places where these machines are for sale then checking on the websites of the internet is one area to try.

Various Types of Welding

hitsaus is the art of fusing two materials, frequently metals or plastics, by the method of melting a portion and adding a molten material which cools and solidifies after a short span of time. The energy sources applied can be different like electric arc, gas flame, laser, friction, ultrasound and a few others. Welding can be done in various environments like open air, outer space and even underwater. It is without a doubt, a dangerous task considering the various hazards involved like toxic fumes, electric shock, burns and overexposures.

So, necessary safety precautions like wearing a mask, goggles and helmets and solid leather gloves must be taken.
Some of the universally employed types of this process are shielded metal arc, gas, gas metal arc and gas tungsten arc welding. The shielded metal arc is the most frequently used among the above mentioned types. Electric current is employed as a source for this technique. Usage of laser and energy beams as a source has become popular in recent times due to minimum weld area.

Hyperbaric welding is the most commonly used technique at areas of elevated pressures, like a hyperbaric chamber and especially underwater. It is a variation of shielded metal arc method. To minimize the risk of bumping into an electric shock, the apparatus used must be insulated and the process must be done in properly controlled environment to avoid mishaps. Spot welding is a method used for fusing overlying metal sheets up to 3mm thick. It has extensive usage in automotive industry. Advantages include high production rates, easy automation and efficient use of energy.

The quality of a weld cannot be assured because of the occasional incompatibility of the filler material and the base material. A fact worth remembering is that, not all materials are suitable for welding. Method to be employed must be carefully selected considering the environment in which the process is being done. Methods to be used in unconventional environments like outer space are also being researched into.

What is Welding and How You Can Use It For Arts and Crafts

Welding is used everywhere around you, be it at home, outdoors, for business or even crafts. Most things are actually welded together, including historical monuments, power plants, ship buildings, bridges, jewelry pieces, refineries and many more. While welding has initially been considered an activity for manufacturers, nowadays craftsmen and hobbyists all over the world have started using it in their own activities. Also homeowners use it for home improvements.

In a nutshell, when you are welding, you are joining various pieces of metal, plastic and other material types together. While forge was the initial process introduced many years ago, newer welding style came to be in the 20th century. Later on newer equipment has been introduced with the latest technological advancements. Mig and Tig welding technology comes to mind here.

Nowadays there are many new and modern tools and accessories used in welding along with various welding equipment that is created based on the latest and most modern technology. Currently you can find welding used in consumable, as well as in non-consumable electrode methods.

In the consumable electrode methods we can find techniques such as flux cored and submerged arc welding, shielded metal and gas metal arc welding. The non-consumable type has techniques included such as gas tungsten, atomic hydrogen and plasma arc.

When it comes to actual products, you can find stick and submerged arc products, mig, tic, wire feeders, multi process units and spot welders, along with water coolers. In addition you will find various plasma cutters that are also doing plasma gouging. The actual welders models are tig welder, mig welder, aluminum welder, metal and steel welder and reconditioned welder.

In the end the most commonly used processes are Stick, TIG, MIG and FCAW. These are the processes that have become popular because they are what industry needs. They produce welds ranging from mass production to x-ray quality. So you can easily see how widely used welding is and why anyone would want to take up on learning welding for their business, for their home improvement and renovating projects, or even as a rewarding hobby.

Common Question and Answers about welding

Below some Question and Answer about Welding :

1) How do the welding requirements of AISC 360-05 generally differ from those in AWS D1.1?

The AISC Specification of chapter J invokes all the requirements of AWS D1.1. The noted in

the AISC Specification is excluded.

2) Which AWS code is intended to apply to joints or members that are designed to resist yield level stresses or strains during design earthquakes.

AWS D1.8 is intended to apply to joints or members that are designed to resist yield level stresses or strains during design earthquakes

3) What two things are required in order to achieve a weld?

In order to achieve a weld, two pieces of metal have been heated and form by a hammer is required without any melting.

4) Molten metal, like the weld pool made during a welding process, has the ability to dissolve large quantities of gases such as nitrogen and oxygen. Why is this a problem and how is it avoided and controlled during welding operations?

The product of the nitrogen and oxygen in the molten metal will decrease the mechanical properties of the metal. To avoided and controlled during welding operations, all of the welding processes are required to accomplish the goals of atomic closeness and atomic cleanliness.

5) Shielding is typically accomplished by one of two means, or a combination of both. Name them and describe how and why they work. Fluxes melt to form slags, which may be used to coat the individual droplets of metal that leave the electrode. Additionally, once the slags contact the weld pool, they float to the surface and shield the pool as well. Slags act as a mechanical lid on the weld pool, keeping nitrogen and oxygen from contaminating the weld deposit. Additionally, such slags perform another important function: For out-of-position welding (vertical, overhead), the slag constitutes a mechanical support for the liquid weld metal, helping to shape the weld bead and hold it in place.

6) How does brazing and soldering differ from arc welding?

Soldering filler metals melt at lower temperatures; brazing filler metals melt at a high temperatures, the temperature should be 450 °F or higher.

7) Describe the significance and meaning of a "prequalified" welding process.

The "prequalified" processes are those that may be used with a prequalified welding procedure specification.

The WPS matches all the requirements for prequalification; however it is not subject to qualification testing.

8) Which welding process is being used with an electrode classified as an E7018? Describe the meaning of each letter or number(s) in the electrode classification above. What is a commonly used slang name for this welding process?

"Code approved" is being used with an electrode classified as an E7018. E indicates an electrode. 70 specifies the minimum specified tensile strength in ksi. 1 indicates the position in which the electrode may be used. 8 designator to describe the coating type, welding current and CVN properties.

9) What part of the AWS D1.1 code requires that SMAW electrodes used to weld ASTM A992 steel be of "low hydrogen" type? What is the concern with using non-low hydrogen electrodes on this steel?

Table 3.1, which is in AWS D1.1 code, show the requirement that SMAW electrodes used to weld ASTM A 992 steel be of "low hydrogen" type. It has a greater ability to weld on contaminated materials and handle poor fit-up conditions.

10) What happens when a low hydrogen electrode package is opened and the electrodes are exposed to the air? What does the "R" indicate on SMAW electrodes bearing this designator? How should low hydrogen electrodes be stored overnight if their hermetically sealed packaging has been opened? Low hydrogen electrode will pick up the moisture from the atmosphere since the package is opened. "R"

indicates a low-hydrogen electrode that has been tested to determine the moisture content of the covering after exposure to a moist environment for 9 hours and has met the maximum level permitted in ANSI/ AWS A5.1. The Hydrogen electrodes can be stored in heated cabinet for overnight storage.

11) What are the two main limitations of the SMAW welding process?

The electrode is a variable resistor and a finite length.

12) What is FCAW and how do the electrodes used in FCAW differ from those used with the SMAW welding process?

FCAW is flux cored arc welding. FCAW have a finite length. It is because these wire electrodes are spooled onto packages that may consist of anywhere from 1 to 1000 lbs of materials. That the difference between SMAW and FCAW.

13) SMAW is a manual welding process, while most FCAW is done semi-automatically, and sometimes automatically. What is meant by manual, semi-automatic and automatic welding?

A manual welding process, while feeding the electrode into the puddle and propelling the electrode along the joint, the arc length must be maintained by the welder, which is the gap between the electrode and the workpiece. In automatic and semi-automatic welding, the operator does not need to maintain the arc length or feed the electrode into the puddle. The power supply maintains the arc length, and the wire feeder delivers the electrode to the arc.

In automatic welding, a mechanism propels the electrode along the joints.

14) Describe the meaning of each letter and number for an E70T-3 electrode. What kind of welding process is involved with this electrode? If a Charpy V-Notch toughness of 20 ft-lbs at -20 degrees Fahrenheit is required, is this electrode appropriate. Can this electrode be used to make a multiple pass fillet weld?

E indicates an electrode. 7 specifies the minimum specified tensile strength in ksi. 0 indicates the position in which the electrode may be used. T indicates a tubular electrode. 3 designator to describe the shielding type (e.g. Gas or self shielding), welding polarity, single versus multiple pass and CVB properties. "Code approved" welding process is involved with this electrode. It cannot specified if charpy V-Notch toughness of 20ft-lbs at -20 oF from Table 2-3. Therefore, it can't be used to make multiple pass fillet weld.

15) Name two distinct advantages of FCAW over SMAW.

The electrode is continuous, eliminating the built-in starts and stops that are inevitable with shielded metal arc welding. It increases amperages can be used with flux cored arc welding, with a corresponding increase in deposition rate and productivity.

16) What would a major limitation of the FCAW-G process be, with regard to field welding of a joint that is part of the seismic-force resisting system of a building? What concern with regard to the weld is being addressed by this limitation? Would you have the same concerns with FCAW-S?

The major limitation of the FCAW-G process would be the need for shielding gas. AWS D1.1 indicates the maximum wind velocity around an arc to 5 mph. A shelter or screen can be erected to limit such wind if necessary. It has the same concerns with FCAW-S.

17) What specific concerns might you have regarding the intermixing (for example between tack welds and welds) of FCAW-S and other welding processes? Does this same concern exist if both the welds and tack welds are made using only FCAW-S?

A very little shielding gas have been produced, however it relies on the addition of large amounts of deoxidizers and denitrifiers to react with oxygen and nitrogen. Aluminum is the primary element used for this purpose, titanium and zirconium may also be used as well. This concern exist if both the welds and tack welds are made using only FCAW-S.

18) Describe the SAW welding process. What positions can this process be used in?

An arc is shielded between one or more bare electrodes and the weld pools by a blanket of granular material called flux that is used to shield the molten metal.

19) What's the difference between active and neutral fluxes used in SAW?

The active fluxes contain deliberate additions of manganese and silicon and are primarily designed for single- or limited - pass welding. Neutral fluxes are designed primarily for multiple-pass weld and do not significantly change the manganese or silicon content of the weld metal.

20) What is the name of a welding process that is very similar to FCAW, but uses a solid or metal-cored electrode instead of a hollow, tubular electrode? What other major difference is there between these two electrodes, specifically with regard shielding of the molten pool? What are a few slang names commonly used for this process?

The gas metal arc welding (GMAW) process is very similar to FCAW, but uses a solid or metal-cored electrode instead of a hollow, tubular electrode. GMAW power supplies may have additional controls for optimizing the output characteristics for certain modes of transfer.

21) Why is GMAW-S, often called "short-arc" welding, generally not suitable for making structural welds?

GMAW-S is a low-energy mode of transfer and welding on thin-gauge materials. It is the only suitable mode of transfer for all-position welding, unless pulsed spray transfer is used.

22) Welded studs are generally visually inspected. However, AWS D1.1 requires proof tests be made during production welding of studs to ensure proper procedures are being followed. Describe the process and frequency of this procedure. The stud need to be welded on a clean materials. When current is too low, or time is too short, the flash typically will not extend around the whole stud. When current is too high, or time is too long, the flash may

extend a long way beyond the ferrule, or may undercut the stud itself. The first two studs should be tested by mechanically bending them over to an approximate 30 degree angle from the original stud axis.

23) What is the formal name of the cutting process known as "burning" steel? Describe how it the process works.

Oxyfuel Gas cutting is the formal name of the cutting process known as "burning" steel. The thermal cutting process that relies on combustion of a fuel

Fitter / Welder Job Opening

FITTER/WELDER Gunderson, LLC located in NW Portland is currently recruiting for experienced welders. Candidates must be able to identify production parts, interpret drawings of assigned work, tack parts together in preparation for welding, hook hoist and turn part for paint or assembly, remove slag with a rattle gun or chipping hammer, weld, slag and grind metal parts on production line. Able to perform the following: math fractions, read tape measure, follow safety procedures, work both independently and in a team, lift, carry, push and or pull 1-50 lbs. for 1-8 hours a day, sit, stand, walk, bend, twist, kneel, walk, climb and reach 1-8 hours a day. Experience with Flux Cored Arc welds (vertical, overhead, and flat fillet) must pass 2, 3 and 4F test, blueprint reading and layout skills, troubleshooting welding equipment, and follow written/verbal instructions.  MUST BE ABLE TO WORK ALL SHIFTS. Applicants who are interested in applying for this position should apply in person at: Gunderson, LLC 4350 NW Front Ave. Portland, OR 97210 between the hours of 7AM - 3PM, Monday - Friday. EOE. Webid: 3108699 GUNDERSON INC.

Free Lincoln Electric seminar focuses on pipeline welding

Lincoln Electric is to host a free pipeline welding seminar for contractors and professionals in the pipeline industry on 29-31 March 2011 at the company's Cleveland, Ohio, headquarters.

The in-depth session takes place over three days.

With the growing demand in energy markets, rehabilitation of existing infrastructure and construction of new cross-country and subsea pipelines will continue to increase.

The seminar will focus on these topics, as well as solutions for overall improved safety, productivity and quality.

Topics will include: solutions to common pipeline welding challenges; understanding hydrogen cracking and how to minimise it; and the effects of welding essential variables, including heat input, on weld metal properties.

Sessions will be followed by welding demonstrations of the latest pipeline welding techniques, equipment and consumables.

Tours of Lincoln's manufacturing facilities will also be included.

The deadline to register for the seminar is 15 March 2011.

For the green collar worker, right now welding is the best career choice and will be even more so in the near future! Welders are not only building the backbone of today’s green industries, but they are also helping the not-so-green industries clean up their technology by building pollution controls and maintaining the world’s pipelines; pipelines that we can no longer live without! Welding, as green jobs go, may not seem like the obvious answer, but the reality is that no matter what green industry you choose, welders will be in demand, and making the big money.

Welding is so important to green energy solutions that companies like Fluor run their own welding schools for experienced welders who are also prospective employees in order to test their skills! Fluor has been on the cutting edge when it comes to energy solutions for almost 100 years and knows how important welders are to their industry. Here is a company that is providing new green energy solutions worldwide and the only shortage they have is in the welding department.

Why not make a difference in the world by helping it go clean and green? Go after the one not-so-obvious, well-paying career choice as a welder. Not sure? How about the ability to make six figures a year without a college degree? Not only will you make great money, but you will also have the time to enjoy it, you’ll travel the world, be respected for what you can do and not who you know, and still help the world be a cleaner,greener, better place!