The most common shielding gases used for these main arc welding processes include argon (Ar), helium (He), carbon dioxide (CO2) and oxygen (O2). While Ar, He and CO2 may be used by themselves (i.e. 100%) for certain applications, in other cases the four gases are mixed together in different combinations to form shielding gas blends.
Cluster reduction in speech is when a consonant cluster, that is two or three consonants occurring in sequence in a word (like ândâ in friend), is reduced by a child into a single consonant through omission.
Phoneme Deletion . Phoneme Deletion is the ability to identify how a word would sound if one sound were omitted. This is a very important step in the development of literacy, as well as general language development. A child who is proficient in this skill can tell you that when the /k/ sound is removed from cat, you get at.