The welding core is the metal core of the electrode. In order to ensure the quality of the weld, there are strict regulations on the content of various metal elements in the weld core. In particular, there are strict restrictions on harmful impurities (such as sulfur and phosphorus), and the quality of the weld core metal should be better than that of the base metal. Arc welding cannot be carried out on a smooth rod without a coating. This is because the arc stability is very poor, splashing is very large, and the weld is not well formed. After long-term practice, it is gradually found that the performance of the electrode is greatly improved by coating the welding core with some mineral raw materials (i.e. electrode coating). (1) Ensure stable arc combustion, so that the welding process is normal. (2) Using the gas produced after the drug skin reaction, protect the arc and the molten pool, prevent the harmful gases in the air (such as nitrogen, oxygen, etc.) from invading the molten pool, such as these gases will cause cracks and pores in the welding material, so that the welding can not achieve the ideal effect. (3) After the drug skin is melted, slag is formed, which covers the weld surface to protect the weld metal, make the weld metal slowly cool, help the gas escape, prevent the generation of pores, and improve the structure and performance of the weld. (4) After melting, various metallurgical reactions will be carried out, such as deoxygenation, sulfur removal, phosphorus removal, etc., so as to improve weld quality and reduce alloying element burning loss.

Deoxygenation of boiling steel is incomplete, oxygen content is high, phosphorus and other impurities distribution is uneven, local overspending, aging sensitivity and cold brittle sensitivity are high, hot cracking tendency is added. If unqualified electrode is used, if the content of carbon and sulfur in the weld metal is too high, cracks will occur. For example, when factories use acidic electrodes to weld Q235-A steel, the high carbon fernoganese in the electrode coating will lead to thermal cracks in the weld.

③ The galvanized iron wire shall not be damaged when it is tightened.

The construction of inner wall and outer wall steel wire mesh can effectively solve the wall cracks, falling off, empty drum phenomenon. Hot dip galvanized steel wire mesh material requirements: net surface leveling, width and length to meet the project required standards, welding process, weight, zinc, etc., with more production and operation, detection certificate is complete.

Sizes

Another place that is tough to tell the quality of the hardware online is those decorative tips on top of the picket called finials.  Many places charge a hefty upgrade fee per panel to add finials to the fence panel.  The worst part is these are often cheap die-cast, aluminum or plastic that ship loose and you have to glue or press them on.  The difference between the fence panel material and finial material will be come apparent over time when the dissimilar metal coatings (or materials like plastic) fade at a different rate and really start to look like a cheap add-on.  Be sure to check what those finial tips are made from and how they are attached.  Our Stronghold Iron uses solid cast-iron finial tips that are welded directly to the picket like the image below.

You can also find combinations of window designs, such as opening outward windows combined with a tilt-and-turn. Of course, it’s also possible to integrate all these types of aluminium windows within a door screen.

The actual extrusion process involves the following details;