Welding Electrode

Welding Electrode

Electrode welding


Most of the SMAW welding electrode coated by a layer of flux, which serves as a gas-forming fluid that protects the metal from the surrounding air contamination. In addition fluk also useful for forming weld slag that also serve to protect the weld from the air surrounding fluid. Electrode layer is a mixture of chemicals that komposisisnya accordance with the requirements of welding. According to the AWS (American Welding Society) electrodes are classified with the letter E and followed by four or five digits as follows E xxxx (x). The first two digits or three digits indicate tensile strength welds three digits indicate
tensile strength of more than 100,000 psi, while two digits indicate the weld tensile strength of less than 100,000 psi. As an example electrode E 6013 has a tensile strength of 60,000 psi (42 Kg/mm2). While the third or fourth digit figure for a greater tensile strength 100,000 psi (70 Kg/mm2) next digit position of the welding point, if the score 1 means for every posisi.pengelasan, number 2 means the weld flat or horizonta l and figure 3 shows for welding flat course. The last digit indicates the type of chemical mixture of the electrode layer.

AC Welding Machine / Welding Rectifire

AC Welding Machine

AC welding machine


Electrical machinery and classified AC welding machine DC welding machine, welding machine AC is usually a welding transformer, welding machines sedangkam DC transformer apart or equipped with a rectifier diode (Changer alternating current into direct current) motor drive typically uses either diesel or petrol motors and electric motors. AC welding machine that uses a transformer or welding transformer.


Currently widely used welding machines DC because DC has
several advantages of the AC welding machines, such as stable arc, polarity can be set.


Las DCSP (Direct Current Straight Polarity) or Las Straight Polarity.
If the base material or materials to be welded is connected to the positive pole (+) and elektrodenya connected with the negative pole (-) in the way of a DC welding machine is called straight polarity welding or DCSP.


In this way the electric arc moves from the electrode to the base material so that the collision of electrons in the material base that resulted in 2 / 3 heat in the base material and the third heat in the electrode. This will result in melting of basic material more than elektrodenya so that the results have deep penetration welding, so that both are used in welding a slow and narrow weld bead and for a thick plate. Las DCRP (Direct Current Reversed Polarity) or Las Polarity behind. With the welding process in this way the basic material connected with the negative pole (-) and elektrodenya connected with the positive pole (+) of DC welding machine, and DCRP so-called electric arc moving from basic materials to the electrode and the collision of electrons in the electrode resulting in 2 / 3 heat at the electrode and the third heat in the base material.


This will produce more so that the melting electrode welds have shallow penetration, and both are used in welding of thin plates with a width of weld bead.


Welding Las AC (alternating current) or Las Las alternating electric current alternating current there is no positive and negative poles (two both the same) and therefore the inverted penyambungannya behind the results remain the same. Each pole will receive 50% heat, resulting in more normal penetration.

SMAW WELDING

SMAW

SMAW WELDING


SMAW welding is a technique by using an electric current flows and electrode arc-shaped webbed. Other types of arc welding with an electric current is submerged arc welding SAW, gas metal arc welding GMAW-MIG, gas tungsten arc welding and plasmaarc G. In SMAW welding gas occurs when the electrode terselaput penyelimut it melts, so the process is not required pressure / pressure inert gas to displace the oxygen or air can cause corrosion or bubbles in the weld-weld. Prose welding occurs because the electric current flowing between the electrodes and welding material forming the heat so it can reach 3000 ° C, thus making the electrode and the material to be welded to melt. Based on its current type, welding is divided into AC and DC current, which distinguished DC Straight polarity-polarity of the direct and reverse polarity - polarity reversed. Welding machine is being divided into two types, namely constant current - constant voltage and current fixed - fixed voltage, dimanapada any arc welding electrical current in case of an enlarged bow will lower and raise the voltage and current in a shortened arc will improve the flow and lowering the voltage.


To get a good weld should:

• using appropriate electrodes
• appropriate type of current
• polarity type is right for DC current
• avoid welding the left-right movement during welding
• short form of the arc current, welding do a steady and orderly
• the rate of welding electrodes in accordance with the speed of the melt.

The problems that often arise in the arc welding current is:

• electrode freezes / stops welding
• form an ugly seam welding
• arc welding current is bad because it expands
• Moderate membrane electrode / flux is generally made dariserat
• wood / cellulose
• titanium oxide
• + titanium base compound
• Mn + Fe + Si
• Iron oxide
• CaCO3, which will form jebnis-type electrode in the form type: E, R, ER, EC, EW, B, RB, RG and F.

Selection of electrodes is based on:

• properties of the materials to be welded
• welding position
• connection type
• number of welding
• density welding connection
• type of current available.

Welding

Welding


Welding is among one of the grafting technique to melt some metals with the parent metal and filler metal with or without pressure and with or without metal enhancer and generate connections continue.


The scope of the use of welding techniques in the construction is very broad, covering shipbuilding, bridges, steel frame, pressure vessels, pipes rapidly, pipelines and so on.

How to calculating required welding wire ?

Welding Process

How to calculating required welding wire ?


One of our task in mechanical work is Welding. Good enggineer should known how to prepare his work. In this case is calculating welding rod. Before the enggineer calculating welding rod, enggineer must be understand about :
a. Techical Drawing,
b. Welding code.
Ok, lets us started to expalin how to calculating welding rod/wire requirement from the simple welding.