Category: WELDING

WELDING, Welding Engineer1 Comment

How welding Arc heat, Temperature be produced?

Amarine Antonio

The term temperature refers to the degree or level of energy in a material and can be measured in degrees with a thermometer. The term heat refers to the quantity of energy in a material and cannot be easily measured. The quantity of heat in a material can be determined by knowing both the temperature and mass (weight) of an object. Likewise, the temperature of an arc from a small diameter electrode is the same as the arc from a large diameter electrode, but the larger arc has more heat. What is the typical temperature of an arc? The temperature … Continue reading How welding Arc heat, Temperature be produced?

WELDING, Welding Engineer2 Comments

Welding Amperage & Heat Relationship

Amarine Antonio

The amount of heat produced by the arc is determined by the amperage. The higher the amperage setting the higher the heat produced by the welding arc, and the lower the amperage setting the lower the heat produced. Each diameter of the electrode has a recommended minimum and maximum amperage range and therefore a recommended heat range. If you were to try to put too many amps through a small diameter electrode it will overheat and could even melt during weld and potential of the welder injury. If the amperage setting is too low for an electrode diameter, the end … Continue reading Welding Amperage & Heat Relationship

WELDING, Welding Engineer4 Comments

Welding Voltage & Arc Length Relationship

Amarine Antonio

The voltage and arc length are closely related. The shorter the arc, the lower the arc voltage and the lower the temperature produced, an as the arc lengthens, the resistance increases, thus causing a rise in the arc voltage and temperature. Most shielded metal arc welding electrodes have chemicals added to their coverings to stabilize the arc. These arc stabilizers form conductive ions that make the arc more stable and reduce the arc resistance. This makes it easier to hold an arc. By lowering the resistance, the arc stabilizers also lower the arc temperature. Other chemicals within the gaseous cloud … Continue reading Welding Voltage & Arc Length Relationship

WELDING, Welding Engineer3 Comments

What is Welding Current?

Amarine Antonio

Welding current is the term used to describe the electricity that jumps across the arc gap between the end of the electrode and the metal being welded. An electric current is the flow of electrons. The resistance to the flow of electrons (electricity) produces heat. The greater the electrical resistance, the greater the heat and temperature that the arc will produce. Air has a high resistance to current flow, so there is a lot of heat and temperature produced by the SMA welding arc. Electrons flow from negative (–) to positive (+). What three units are used to describe any … Continue reading What is Welding Current?

WELDING, Welding Engineer2 Comments

What are the advantages of SMA welding?

Amarine Antonio

SMA: Shield Metal Arc Welding (SMAW) SMAW is the most widely used welding process for metal fabrication because of its low cost, flexibility, portability, and versatility. The welding machine itself can be as simple as a 110-volt, step-down transformer that can be plugged into a normal electrical outlet. The electrodes are available from a large number of manufacturers in packages ranging from 1 lb (0.5 kg) to 50 lb (22 kg). The SMAW process is very versatile because the same SMA welding machine can be used to make a wide variety of weld joint designs in a wide variety of metal … Continue reading What are the advantages of SMA welding?

PIPING, WELDING, WELDING METALLURGYLeave a comment

Weld Carbon steel to Stainless steel

Amarine Antonio

It is not uncommon to find fabricating shops that are welding a variety of metals including carbon steel, stainless steel, aluminum, and nickel alloys.  In many cases, some of these materials need to be welded to other types.  Once a very common situation, especially in shipbuilding, oil & gas projects in welding carbon steel to stainless. One of the most frequent questions we receive about this is what filler metal to use.  Welding dissimilar metals can be tricky, especially when you get into the exotic alloys.  Always consult with the manufacturer of the base material or seek the expert advice … Continue reading Weld Carbon steel to Stainless steel

AWS D1.1 & ASME IX, WELDING1 Comment

PQR – Bending test requirements (AWS D1.1, ASME IX or API)

Amarine Antonio

The bend test is a simple and inexpensive qualitative test that can be used to evaluate both the ductility and soundness of a material. It is often used as a quality control test for butt-welded joints, having the advantage of simplicity of both test piece and equipment. The bend test may be free formed or guided. The guided bend test is where the coupon is wrapped around a former of a specified diameter and is the type of test specified in the welding procedure and welder qualification specifications. For example, it may be a requirement in ASME IX, ISO 9606 and ISO 15614 Part … Continue reading PQR – Bending test requirements (AWS D1.1, ASME IX or API)