. Squeezing pressure is too low aluminum square bar prices, then welded together low. Squeeze caused by low pressure factor is integrated aluminum square bar, there are factors that have mold on the process. There are several situations: a squeeze relatively low. To improve the welding together can take the following methods: 1 / thickening of the upper mold 2 / porthole appropriately reduced 3 / extrusion temperature appropriate to reduce the normal hollow profile extrusion temperature of 460-500 ℃, can be reduced to 420-440 ℃ . This method is very useful in the field. 4 / choose a larger extruder barrel, about to squeeze the profile arrangement on the larger models. 5 / welding chamber depth and selection (by the shunt bridge "sink" approach). But pay attention to Shen bridge will reduce extrusion pressure, thus making this method when you want, depending on the circumstances. For the use of "+ yu" shunt-mode bridge structure more effective. Aluminum and stainless steel, aluminum and stainless steel pipe physical properties of high frequency induction welded pipe is the biggest problem affecting oxide. 1) is easily oxidized aluminum Al2O3, melting point up to 2050 ℃ aluminum square bar Which is good, and the melting point of aluminum is 658 ℃, the welding, the oxide film prevents fusion of the base metal is melted together, prone to incomplete penetration defects . 2) is similar to aluminum, when stainless steel w (Cr)> 12%, the chromium preferentially combines with oxygen in the base material and form a dense surface oxide film Cr2O3 than iron, the melting point of up to 2265 ℃, and the melting point of chromium is 1857 ℃, there will be similar problems. Supply of aluminum square bar manufacturer | rolls Aluminum (certified) | aluminum square bar provided by the Aluminum Co., Ltd. Jinan rolls. Jinan Heshun Aluminum Co. (www.jnhsly.com) Shandong Jinan, aluminum products leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Aluminum leadership in cis with the staff warmly welcome all inquiries negotiations to create a better future for aluminum rolls.